You can create bookmarks that sync automatically across all your devices. A free account is required to add bookmarks.
Previously saved locations are now found under the Locations tab. The Bookmarks widget is located on the left side of the screen or can be enabled via the Widgets menu in the bottom toolbar.
You can customize your screen by toggling and rearranging widgets such as Most tracked flights, Last clicked flights, or Statistics.
To open the Bookmarks widget, swipe down below the search bar at the top of the screen. Here, you can bookmark aircraft, flights, airports, or locations for quick access.
Tap Add bookmark or the star icon on any flight. A filled star shows the item is saved.
"Tap Add bookmark or the star icon on any flight. A filled star confirms it’s saved."
Author’s summary: Bookmarking on Flightradar24 allows easy access to favorite aircraft, flights, and locations, with syncing across devices and customizable limits depending on your account level.