Mode available for tablet and big screens it will be two column. See the attached scrrenshot. It should actually display the expanded chats on the right side but its showing no chats selected
As per your concern, we would request you to kindly perform the following steps to resolve your issue.
Clear app cache through Device care: Settings > Device care > Storage > CLEAN NOW.
Note: To delete files or uninstall apps that you do not use anymore, select a category under USER DATA. Then, tick items to select and tap DELETE or UNINSTALL.
The clear cache memory of a particular application: Settings > Apps > Now pick the app that you like to clear off the cache memory > Storage > Clear Cache.
Reset the device Settings: Settings > General Management > Reset settings>Reset all settings to their default.
Tap on Google Play Store app or Galaxy Store> Manage apps & device> Apps available to update> If you want to update apps individually, tap See details and then tap the Update button next to the app you would like to update.
Keep your apps updated: Developers often release updates to improve their app's performance and compatibility. It is highly recommended to keep the apps on your device up to date.
Galaxy Store apps: Open Galaxy Store, tap the Menu (the three horizontal lines), in the upper left corner, and then tap Updates. From here, you can either tap the circling arrow next to individual apps to update one at a time or tap Update All to install all available updates.
Play Store apps: Open the Play Store, tap, and then tap your profile picture. Tap My apps & games. From here, you can either tap Update next to individual apps or tap Update All to install all available updates.
In case the issue still occurs kindly contact the particular application helpline once, to make sure there is no issue from their end. You can reach the app developer through the email channel for which you please login to Play Store> select more option> select installed app> click on read more.
