Hi JoeyLP, The timeline in first screenshot is from web client and timeline in second screenshot is from UCI. As Pradeep said, legacy web client is deprecated, so OOB design of timeline in UCI is like second screenshot, which will show all posts together,no longer divided into different tabs. In fact, the timeline shows activities, notes and posts together. If you don’t want to show all, you can filter it by any conditions through clicking button, just like following screenshot: You can refer following links for more details about timeline in UCI. Timeline Overview for Users – Power Apps | Microsoft Docs Configure Timeline | Microsoft Docs