SettingsDiary

Records your graphics settings, shows what changed after a patch or zone change, lets you tag zones as fine or dropped, and restores the previous snapshot.

opens the panel. Drag it anywhere. Fine and Dropped tag the current zone. Undo writes back the previous saved snapshot. It also writes a line to chat when you tag or restore.

It does not change settings on its own. A line is logged only when a watched CVar actually differs, or when the build number changes. 

In game, tick Settings Diary, log in, and type /sdiary.