diff --git a/examples/vite/src/App.tsx b/examples/vite/src/App.tsx
index fcc3f52550..2e7f5062ad 100644
--- a/examples/vite/src/App.tsx
+++ b/examples/vite/src/App.tsx
@@ -33,7 +33,6 @@ import data from '@emoji-mart/data/sets/14/native.json';
 import { humanId } from 'human-id';
 
 import { appSettingsStore, useAppSettingsSelector } from './AppSettings/state.ts';
-import { DESKTOP_LAYOUT_BREAKPOINT } from './ChatLayout/constants.ts';
 import { ChannelsPanels, ThreadsPanels } from './ChatLayout/Panels.tsx';
 import { PanelLayoutStyleSync, SidebarLayoutSync } from './ChatLayout/Resize.tsx';
 import {
@@ -159,9 +158,6 @@ const App = () => {
     tokenOrProvider: tokenProvider,
     userData: { id: userId },
   });
-  const useResponsiveInitialNav =
-    typeof window === 'undefined' || window.innerWidth < DESKTOP_LAYOUT_BREAKPOINT;
-
   const searchController = useMemo(() => {
     if (!chatClient) return undefined;
 
@@ -265,7 +261,6 @@ const App = () => {
         searchController={searchController}
         client={chatClient}
         initialNavOpen={initialNavOpen}
-        initialNavOpenResponsive={useResponsiveInitialNav}
         isMessageAIGenerated={isMessageAIGenerated}
         theme={chatTheme}
       >
diff --git a/src/components/Chat/Chat.tsx b/src/components/Chat/Chat.tsx
index b452b6486d..d56123937a 100644
--- a/src/components/Chat/Chat.tsx
+++ b/src/components/Chat/Chat.tsx
@@ -27,10 +27,10 @@ export type ChatProps = {
   defaultLanguage?: SupportedTranslations;
   /** Instance of Stream i18n */
   i18nInstance?: Streami18n;
-  /** Initial status of mobile navigation. Ignored when initialNavOpenResponsive is true. */
+  /**
+   * Initial open state of the sidebar. Omit for responsive (viewport-derived); set to true/false for an explicit initial state.
+   */
   initialNavOpen?: boolean;
-  /** When true, sidebar (ChannelList/ThreadList + selector) is open on load; it closes when a channel or thread is selected. */
-  initialNavOpenResponsive?: boolean;
   /** Instance of SearchController class that allows to control all the search operations. */
   searchController?: SearchController;
   /** Used for injecting className/s to the Channel and ChannelList components */
@@ -56,8 +56,7 @@ export const Chat = (props: PropsWithChildren<ChatProps>) => {
     customClasses,
     defaultLanguage,
     i18nInstance,
-    initialNavOpen = true,
-    initialNavOpenResponsive = true,
+    initialNavOpen,
     isMessageAIGenerated,
     searchController: customChannelSearchController,
     theme = 'messaging light',
@@ -79,7 +78,6 @@ export const Chat = (props: PropsWithChildren<ChatProps>) => {
     defaultLanguage,
     i18nInstance,
     initialNavOpen,
-    initialNavOpenResponsive,
   });
 
   const channelsQueryState = useChannelsQueryState();
diff --git a/src/components/Chat/hooks/useChat.ts b/src/components/Chat/hooks/useChat.ts
index c4cd406e85..1d8085055b 100644
--- a/src/components/Chat/hooks/useChat.ts
+++ b/src/components/Chat/hooks/useChat.ts
@@ -28,10 +28,10 @@ export type UseChatParams = {
   client: StreamChat;
   defaultLanguage?: SupportedTranslations;
   i18nInstance?: Streami18n;
-  /** Initial open state of the sidebar. Ignored when initialNavOpenResponsive is true. */
+  /**
+   * Initial open state of the sidebar. Omit for responsive (viewport-derived); set to true/false for an explicit initial state.
+   */
   initialNavOpen?: boolean;
-  /** When true, initial nav state is open so sidebar (ChannelList/ThreadList + selector) is visible; close on channel/thread selection. */
-  initialNavOpenResponsive?: boolean;
 };
 
 export const useChat = ({
@@ -39,7 +39,6 @@ export const useChat = ({
   defaultLanguage = 'en',
   i18nInstance,
   initialNavOpen,
-  initialNavOpenResponsive = false,
 }: UseChatParams) => {
   const [translators, setTranslators] = useState<TranslationContextValue>({
     t: defaultTranslatorFunction,
@@ -50,8 +49,8 @@ export const useChat = ({
   const [channel, setChannel] = useState<Channel>();
   const [mutes, setMutes] = useState<Array<Mute>>([]);
   const [navOpen, setNavOpen] = useState(() => {
-    if (initialNavOpenResponsive) return getDefaultNavOpenFromViewport() ?? true;
-    return initialNavOpen === false ? false : true;
+    if (initialNavOpen === undefined) return getDefaultNavOpenFromViewport() ?? true;
+    return initialNavOpen;
   });
   const [latestMessageDatesByChannels, setLatestMessageDatesByChannels] = useState({});