When viewing your Twitter (X) timeline on the mobile app, you can identify whether you're seeing a chronological or algorithmic timeline by checking the icon in the top-right corner of the screen. If it shows three small stars, you're using the algorithmic "Home" timeline. If it shows a small clock, you're using the chronological "Latest" timeline. On the desktop version of Twitter, you can identify your current timeline by checking the tabs at the top of your feed. The highlighted tab, either "Home" or "Latest," indicates your current timeline mode.