diff --git a/src/app/components/custom-select/custom-select.spec.ts b/src/app/components/custom-select/custom-select.spec.ts
new file mode 100644
index 0000000..d13564d
--- /dev/null
+++ b/src/app/components/custom-select/custom-select.spec.ts
@@ -0,0 +1,56 @@
+import { Component } from '@angular/core';
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+import { By } from '@angular/platform-browser';
+import { FormsModule } from '@angular/forms';
+
+import { CustomSelectComponent } from './custom-select';
+
+@Component({
+  standalone: true,
+  imports: [FormsModule, CustomSelectComponent],
+  template: `
+    <app-select [options]="options" [(ngModel)]="firstValue"></app-select>
+    <app-select [options]="options" [(ngModel)]="secondValue"></app-select>
+  `,
+})
+class HostComponent {
+  options = [
+    { label: 'Primeira', value: 'one' },
+    { label: 'Segunda', value: 'two' },
+  ];
+  firstValue = 'one';
+  secondValue = 'two';
+}
+
+describe('CustomSelectComponent', () => {
+  let fixture: ComponentFixture<HostComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [HostComponent],
+    }).compileComponents();
+
+    fixture = TestBed.createComponent(HostComponent);
+    fixture.detectChanges();
+  });
+
+  it('should keep only one select panel open at a time', () => {
+    const selectComponents = fixture.debugElement
+      .queryAll(By.directive(CustomSelectComponent))
+      .map((debugEl) => debugEl.componentInstance as CustomSelectComponent);
+    const triggerButtons = fixture.nativeElement.querySelectorAll('.app-select-trigger') as NodeListOf<HTMLButtonElement>;
+
+    triggerButtons[0].click();
+    fixture.detectChanges();
+
+    expect(selectComponents[0].isOpen).toBeTrue();
+    expect(selectComponents[1].isOpen).toBeFalse();
+
+    triggerButtons[1].click();
+    fixture.detectChanges();
+
+    expect(selectComponents[0].isOpen).toBeFalse();
+    expect(selectComponents[1].isOpen).toBeTrue();
+    expect(fixture.nativeElement.querySelectorAll('.app-select-panel').length).toBe(1);
+  });
+});
diff --git a/src/app/components/custom-select/custom-select.ts b/src/app/components/custom-select/custom-select.ts
index 3ef4bcb..820eef0 100644
--- a/src/app/components/custom-select/custom-select.ts
+++ b/src/app/components/custom-select/custom-select.ts
@@ -1,6 +1,8 @@
-import { Component, ElementRef, HostListener, Input, forwardRef } from '@angular/core';
+import { Component, ElementRef, HostListener, Input, OnDestroy, forwardRef } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
+import { Subscription } from 'rxjs';
+import { DropdownCoordinatorService } from '../../services/dropdown-coordinator.service';
 
 @Component({
   selector: 'app-select',
@@ -16,7 +18,9 @@ import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
     },
   ],
 })
-export class CustomSelectComponent implements ControlValueAccessor {
+export class CustomSelectComponent implements ControlValueAccessor, OnDestroy {
+  private static nextDropdownId = 0;
+
   @Input() options: any[] = [];
   @Input() placeholder = 'Selecione uma opção';
   @Input() labelKey = 'label';
@@ -29,11 +33,22 @@ export class CustomSelectComponent implements ControlValueAccessor {
   isOpen = false;
   value: any = null;
   searchTerm = '';
+  private readonly dropdownId = `custom-select-${CustomSelectComponent.nextDropdownId++}`;
+  private readonly dropdownSyncSub: Subscription;
 
   private onChange: (value: any) => void = () => {};
   private onTouched: () => void = () => {};
 
-  constructor(private host: ElementRef<HTMLElement>) {}
+  constructor(
+    private host: ElementRef<HTMLElement>,
+    private dropdownCoordinator: DropdownCoordinatorService
+  ) {
+    this.dropdownSyncSub = this.dropdownCoordinator.activeDropdownId$.subscribe((activeId) => {
+      if (this.isOpen && activeId !== this.dropdownId) {
+        this.close(false);
+      }
+    });
+  }
 
   writeValue(value: any): void {
     this.value = value;
@@ -49,7 +64,7 @@ export class CustomSelectComponent implements ControlValueAccessor {
 
   setDisabledState(isDisabled: boolean): void {
     this.disabled = isDisabled;
-    if (this.disabled) this.isOpen = false;
+    if (this.disabled) this.close();
   }
 
   get displayLabel(): string {
@@ -65,13 +80,21 @@ export class CustomSelectComponent implements ControlValueAccessor {
 
   toggle(): void {
     if (this.disabled) return;
-    this.isOpen = !this.isOpen;
-    if (!this.isOpen) this.searchTerm = '';
+    if (this.isOpen) {
+      this.close();
+      return;
+    }
+
+    this.dropdownCoordinator.requestOpen(this.dropdownId);
+    this.isOpen = true;
   }
 
-  close(): void {
+  close(notifyCoordinator = true): void {
     this.isOpen = false;
     this.searchTerm = '';
+    if (notifyCoordinator) {
+      this.dropdownCoordinator.clear(this.dropdownId);
+    }
   }
 
   selectOption(option: any): void {
@@ -148,4 +171,9 @@ export class CustomSelectComponent implements ControlValueAccessor {
   onEsc(): void {
     if (this.isOpen) this.close();
   }
+
+  ngOnDestroy(): void {
+    this.close();
+    this.dropdownSyncSub.unsubscribe();
+  }
 }
diff --git a/src/app/pages/geral/geral.spec.ts b/src/app/pages/geral/geral.spec.ts
index a16d540..4f94d6b 100644
--- a/src/app/pages/geral/geral.spec.ts
+++ b/src/app/pages/geral/geral.spec.ts
@@ -5,6 +5,7 @@ import { HttpParams } from '@angular/common/http';
 import { provideRouter } from '@angular/router';
 
 import { Geral } from './geral';
+import { DropdownCoordinatorService } from '../../services/dropdown-coordinator.service';
 
 describe('Geral', () => {
   let component: Geral;
@@ -171,4 +172,20 @@ describe('Geral', () => {
     expect(params.get('includeAssignedReservaInAll')).toBeNull();
     expect(params.get('skil')).toBe('RESERVA');
   });
+
+  it('should close custom filter dropdowns when another filter dropdown opens', () => {
+    const dropdownCoordinator = TestBed.inject(DropdownCoordinatorService);
+
+    component.toggleAdditionalMenu();
+    expect(component.showAdditionalMenu).toBeTrue();
+
+    component.toggleClientMenu();
+    expect(component.showClientMenu).toBeTrue();
+    expect(component.showAdditionalMenu).toBeFalse();
+
+    dropdownCoordinator.requestOpen('external-filter');
+
+    expect(component.showClientMenu).toBeFalse();
+    expect(component.showAdditionalMenu).toBeFalse();
+  });
 });
diff --git a/src/app/pages/geral/geral.ts b/src/app/pages/geral/geral.ts
index 7f13668..06efc75 100644
--- a/src/app/pages/geral/geral.ts
+++ b/src/app/pages/geral/geral.ts
@@ -31,6 +31,7 @@ import {
   type MveAuditIssue,
   type MveAuditRun,
 } from '../../services/mve-audit.service';
+import { DropdownCoordinatorService } from '../../services/dropdown-coordinator.service';
 import { firstValueFrom, Subscription, filter } from 'rxjs';
 import { environment } from '../../../environments/environment';
 import { confirmDeletionWithTyping } from '../../utils/destructive-confirmation';
@@ -361,9 +362,14 @@ interface MveApplySelectionSummary {
   styleUrls: ['./geral.scss']
 })
 export class Geral implements OnInit, AfterViewInit, OnDestroy {
+  private static nextFilterDropdownScopeId = 0;
+
   readonly vm = this;
   readonly batchMassColumnGuide = BATCH_MASS_COLUMN_GUIDE;
   toastMessage = '';
+  private readonly filterDropdownScopeId = Geral.nextFilterDropdownScopeId++;
+  private readonly clientDropdownId = `geral-client-filter-${this.filterDropdownScopeId}`;
+  private readonly additionalDropdownId = `geral-additional-filter-${this.filterDropdownScopeId}`;
 
   @ViewChild('successToast', { static: false }) successToast!: ElementRef;
   @ViewChild('excelInput') excelInput!: ElementRef<HTMLInputElement>;
@@ -385,7 +391,8 @@ export class Geral implements OnInit, AfterViewInit, OnDestroy {
     private tenantSyncService: TenantSyncService,
     private solicitacoesLinhasService: SolicitacoesLinhasService,
     private tableExportService: TableExportService,
-    private mveAuditService: MveAuditService
+    private mveAuditService: MveAuditService,
+    private dropdownCoordinator: DropdownCoordinatorService
   ) {}
 
   private readonly apiBase = buildApiEndpoint(environment.apiUrl, 'lines');
@@ -509,6 +516,7 @@ export class Geral implements OnInit, AfterViewInit, OnDestroy {
   private editingId: string | null = null;
   private searchTimer: any = null;
   private navigationSub?: Subscription;
+  private dropdownSyncSub?: Subscription;
   private keepPageOnNextGroupsLoad = false;
 
   private searchResolvedClient: string | null = null;
@@ -968,12 +976,12 @@ export class Geral implements OnInit, AfterViewInit, OnDestroy {
     let changed = false;
 
     if (this.showClientMenu && !insideClient) {
-      this.showClientMenu = false;
+      this.closeClientDropdown();
       changed = true;
     }
 
     if (this.showAdditionalMenu && !insideAdditional) {
-      this.showAdditionalMenu = false;
+      this.closeAdditionalDropdown();
       changed = true;
     }
 
@@ -999,12 +1007,12 @@ export class Geral implements OnInit, AfterViewInit, OnDestroy {
       let changed = false;
 
       if (this.showClientMenu) {
-        this.showClientMenu = false;
+        this.closeClientDropdown();
         changed = true;
       }
 
       if (this.showAdditionalMenu) {
-        this.showAdditionalMenu = false;
+        this.closeAdditionalDropdown();
         changed = true;
       }
 
@@ -1018,6 +1026,7 @@ export class Geral implements OnInit, AfterViewInit, OnDestroy {
   ngOnDestroy(): void {
     if (this.searchTimer) clearTimeout(this.searchTimer);
     this.navigationSub?.unsubscribe();
+    this.dropdownSyncSub?.unsubscribe();
   }
 
   ngOnInit(): void {
@@ -1035,6 +1044,16 @@ export class Geral implements OnInit, AfterViewInit, OnDestroy {
       this.selectedAdditionalServices = [];
       this.selectedClients = [];
     }
+
+    this.dropdownSyncSub = this.dropdownCoordinator.activeDropdownId$.subscribe((activeId) => {
+      if (activeId !== this.clientDropdownId) {
+        this.closeClientDropdown(false);
+      }
+
+      if (activeId !== this.additionalDropdownId) {
+        this.closeAdditionalDropdown(false);
+      }
+    });
   }
 
   async ngAfterViewInit() {
@@ -2536,27 +2555,43 @@ export class Geral implements OnInit, AfterViewInit, OnDestroy {
 
   toggleClientMenu() {
     if (this.isClientRestricted) return;
-    if (!this.showClientMenu) this.showAdditionalMenu = false;
-    this.showClientMenu = !this.showClientMenu;
+    if (this.showClientMenu) {
+      this.closeClientDropdown();
+      return;
+    }
+
+    this.dropdownCoordinator.requestOpen(this.clientDropdownId);
+    this.showClientMenu = true;
   }
 
   toggleAdditionalMenu() {
     if (this.isClientRestricted) return;
-    if (!this.showAdditionalMenu) this.showClientMenu = false;
-    this.showAdditionalMenu = !this.showAdditionalMenu;
+    if (this.showAdditionalMenu) {
+      this.closeAdditionalDropdown();
+      return;
+    }
+
+    this.dropdownCoordinator.requestOpen(this.additionalDropdownId);
+    this.showAdditionalMenu = true;
   }
 
-  closeClientDropdown() {
+  closeClientDropdown(notifyCoordinator = true) {
     this.showClientMenu = false;
+    if (notifyCoordinator) {
+      this.dropdownCoordinator.clear(this.clientDropdownId);
+    }
   }
 
-  closeAdditionalDropdown() {
+  closeAdditionalDropdown(notifyCoordinator = true) {
     this.showAdditionalMenu = false;
+    if (notifyCoordinator) {
+      this.dropdownCoordinator.clear(this.additionalDropdownId);
+    }
   }
 
   closeFilterDropdowns() {
-    this.showClientMenu = false;
-    this.showAdditionalMenu = false;
+    this.closeClientDropdown();
+    this.closeAdditionalDropdown();
   }
 
   selectClient(client: string | null) {
diff --git a/src/app/services/dropdown-coordinator.service.ts b/src/app/services/dropdown-coordinator.service.ts
new file mode 100644
index 0000000..bb3cd73
--- /dev/null
+++ b/src/app/services/dropdown-coordinator.service.ts
@@ -0,0 +1,25 @@
+import { Injectable } from '@angular/core';
+import { BehaviorSubject } from 'rxjs';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class DropdownCoordinatorService {
+  private readonly activeDropdownIdSubject = new BehaviorSubject<string | null>(null);
+  readonly activeDropdownId$ = this.activeDropdownIdSubject.asObservable();
+
+  get activeDropdownId(): string | null {
+    return this.activeDropdownIdSubject.value;
+  }
+
+  requestOpen(id: string): void {
+    if (!id || this.activeDropdownIdSubject.value === id) return;
+    this.activeDropdownIdSubject.next(id);
+  }
+
+  clear(id?: string): void {
+    if (id && this.activeDropdownIdSubject.value !== id) return;
+    if (this.activeDropdownIdSubject.value === null) return;
+    this.activeDropdownIdSubject.next(null);
+  }
+}