diff --git a/webapp/channels/src/plugins/registry.ts b/webapp/channels/src/plugins/registry.ts
index d406e85a517..bedf19d27b8 100644
--- a/webapp/channels/src/plugins/registry.ts
+++ b/webapp/channels/src/plugins/registry.ts
@@ -1095,6 +1095,7 @@ export default class PluginRegistry {
      * Accepts the following:
      * - component - A react component to display in the Right-Hand Sidebar.
      * - title - A string or JSX element to display as a title for the RHS.
+     * - showPopout - Optional boolean (default: true). Set to false to hide the "Open in new window" button in the RHS header.
      * Returns:
      * - id: a unique identifier
      * - showRHSPlugin: the action to dispatch that will open the RHS.
@@ -1104,12 +1105,15 @@ export default class PluginRegistry {
     registerRightHandSidebarComponent = reArg([
         'component',
         'title',
+        'showPopout',
     ], ({
         component,
         title,
+        showPopout = true,
     }: {
         component: RightHandSidebarComponent['component'];
         title: ReactResolvable;
+        showPopout?: boolean;
     }) => {
         const id = generateId();
 
@@ -1118,6 +1122,7 @@ export default class PluginRegistry {
             pluginId: this.id,
             component,
             title: resolveReactElement(title),
+            showPopout,
         });
 
         return {id, showRHSPlugin: showRHSPlugin(id), hideRHSPlugin: hideRHSPlugin(id), toggleRHSPlugin: toggleRHSPlugin(id)};
diff --git a/webapp/channels/src/plugins/rhs_plugin/index.ts b/webapp/channels/src/plugins/rhs_plugin/index.ts
index 88756fa1cc4..2fe78f81291 100644
--- a/webapp/channels/src/plugins/rhs_plugin/index.ts
+++ b/webapp/channels/src/plugins/rhs_plugin/index.ts
@@ -21,6 +21,7 @@ function mapStateToProps(state: GlobalState) {
         pluggableId,
         title: pluginTitle,
         pluginId,
+        showPopout: pluginComponent?.showPopout ?? true,
     };
 }
 
diff --git a/webapp/channels/src/plugins/rhs_plugin/rhs_plugin.test.tsx b/webapp/channels/src/plugins/rhs_plugin/rhs_plugin.test.tsx
new file mode 100644
index 00000000000..dfe30113499
--- /dev/null
+++ b/webapp/channels/src/plugins/rhs_plugin/rhs_plugin.test.tsx
@@ -0,0 +1,146 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import React from 'react';
+
+import type {DeepPartial} from '@mattermost/types/utilities';
+
+import {renderWithContext, screen} from 'tests/react_testing_utils';
+
+import type {GlobalState} from 'types/store';
+
+import RhsPlugin from './rhs_plugin';
+
+import ConnectedRhsPlugin from '.';
+
+jest.mock('components/search_results_header', () => ({
+    __esModule: true,
+    default: ({children, newWindowHandler}: {children: React.ReactNode; newWindowHandler?: () => void}) => (
+        <div
+            data-testid='search-results-header'
+            data-has-window-handler={newWindowHandler === undefined ? 'false' : 'true'}
+        >
+            {children}
+        </div>
+    ),
+}));
+
+jest.mock('plugins/pluggable', () => ({
+    __esModule: true,
+    default: () => <div data-testid='pluggable'/>,
+}));
+
+jest.mock('utils/popouts/popout_windows', () => ({
+    popoutRhsPlugin: jest.fn(),
+}));
+
+const baseState: DeepPartial<GlobalState> = {
+    entities: {
+        general: {config: {}},
+        teams: {
+            currentTeamId: 'team-id',
+            teams: {'team-id': {id: 'team-id', name: 'test-team'}},
+        },
+        channels: {
+            currentChannelId: 'channel-id',
+            channels: {'channel-id': {id: 'channel-id', name: 'test-channel'}},
+        },
+        preferences: {myPreferences: {}},
+    },
+    plugins: {
+        plugins: {'plugin-id': {name: 'Test Plugin'}},
+        components: {
+            RightHandSidebarComponent: [],
+        },
+    },
+    views: {
+        rhs: {pluggableId: ''},
+    },
+};
+
+describe('RhsPlugin', () => {
+    describe('component', () => {
+        it('passes newWindowHandler to SearchResultsHeader when showPopout is true', () => {
+            renderWithContext(
+                <RhsPlugin
+                    showPluggable={true}
+                    pluggableId='pluggable-id'
+                    title='Test Title'
+                    pluginId='plugin-id'
+                    showPopout={true}
+                />,
+                baseState,
+            );
+
+            expect(screen.getByTestId('search-results-header')).toHaveAttribute('data-has-window-handler', 'true');
+        });
+
+        it('passes undefined for newWindowHandler to SearchResultsHeader when showPopout is false', () => {
+            renderWithContext(
+                <RhsPlugin
+                    showPluggable={true}
+                    pluggableId='pluggable-id'
+                    title='Test Title'
+                    pluginId='plugin-id'
+                    showPopout={false}
+                />,
+                baseState,
+            );
+
+            expect(screen.getByTestId('search-results-header')).toHaveAttribute('data-has-window-handler', 'false');
+        });
+
+        it('defaults showPopout to true when the prop is omitted', () => {
+            renderWithContext(
+                <RhsPlugin
+                    showPluggable={true}
+                    pluggableId='pluggable-id'
+                    title='Test Title'
+                    pluginId='plugin-id'
+                />,
+                baseState,
+            );
+
+            expect(screen.getByTestId('search-results-header')).toHaveAttribute('data-has-window-handler', 'true');
+        });
+    });
+
+    describe('mapStateToProps', () => {
+        const pluggableId = 'pluggable-id';
+
+        function stateWithRegisteredComponent(showPopout?: boolean): DeepPartial<GlobalState> {
+            const component: Record<string, unknown> = {
+                id: pluggableId,
+                pluginId: 'plugin-id',
+                title: 'Test Title',
+            };
+            if (showPopout !== undefined) {
+                component.showPopout = showPopout;
+            }
+            return {
+                ...baseState,
+                plugins: {
+                    ...baseState.plugins,
+                    components: {
+                        RightHandSidebarComponent: [component as any],
+                    },
+                },
+                views: {
+                    rhs: {pluggableId},
+                },
+            };
+        }
+
+        it('defaults showPopout to true when component showPopout field is undefined', () => {
+            renderWithContext(<ConnectedRhsPlugin/>, stateWithRegisteredComponent(undefined));
+
+            expect(screen.getByTestId('search-results-header')).toHaveAttribute('data-has-window-handler', 'true');
+        });
+
+        it('passes showPopout: false through to hide the popout button', () => {
+            renderWithContext(<ConnectedRhsPlugin/>, stateWithRegisteredComponent(false));
+
+            expect(screen.getByTestId('search-results-header')).toHaveAttribute('data-has-window-handler', 'false');
+        });
+    });
+});
diff --git a/webapp/channels/src/plugins/rhs_plugin/rhs_plugin.tsx b/webapp/channels/src/plugins/rhs_plugin/rhs_plugin.tsx
index bb378dcfa6f..9e7bd2a3b3d 100644
--- a/webapp/channels/src/plugins/rhs_plugin/rhs_plugin.tsx
+++ b/webapp/channels/src/plugins/rhs_plugin/rhs_plugin.tsx
@@ -21,9 +21,10 @@ export type Props = {
     pluggableId: string;
     title: React.ReactNode;
     pluginId?: string;
+    showPopout?: boolean;
 };
 
-const RhsPlugin = ({showPluggable, pluggableId, title, pluginId}: Props) => {
+const RhsPlugin = ({showPluggable, pluggableId, title, pluginId, showPopout = true}: Props) => {
     const intl = useIntl();
     const currentTeam = useSelector(getCurrentTeam);
     const currentChannel = useSelector(getCurrentChannel);
@@ -51,7 +52,7 @@ const RhsPlugin = ({showPluggable, pluggableId, title, pluginId}: Props) => {
             id='rhsContainer'
             className='sidebar-right__body'
         >
-            <SearchResultsHeader newWindowHandler={newWindowHandler}>
+            <SearchResultsHeader newWindowHandler={showPopout ? newWindowHandler : undefined}>
                 {title}
             </SearchResultsHeader>
             {
diff --git a/webapp/channels/src/types/store/plugins.ts b/webapp/channels/src/types/store/plugins.ts
index c3ccdbe2f77..d94251af7b4 100644
--- a/webapp/channels/src/types/store/plugins.ts
+++ b/webapp/channels/src/types/store/plugins.ts
@@ -350,6 +350,7 @@ export type PostDropdownMenuItemComponent = PluginComponent & {
 export type RightHandSidebarComponent = PluginComponent & {
     title: PluggableText;
     component: React.ComponentType<BasePluggableProps>;
+    showPopout?: boolean;
 };
 
 export type SearchHintsComponent = PluginComponent & {