Uninstalling

1. Close F1 25.
2. Run swofty restore. If it reports files it could not restore, resolve those first.
3. On Linux, clear F1 25's launch option in Steam.
4. Remove the launcher and its data folder.

Deleting the data folder removes your installed mods, maps, profiles, backups and any saves stored there. Keep a copy of anything you want to use later.

Steam's Verify integrity of game files can repair game files, but it does not remove files added by the launcher. See Restoring the game.