My settings for default sort, appearance, favorites, etc. have reset twice this month, which I can’t remember happening ever before. Is the problem on my end, or have there been app updates that required it?
I’ve found the backup/restore button now, so I can hopefully recover it next time.
The only time I’ve had this is back when I thought the settings in the kebab menu (top right) controlled everything, until I realised the preferences in Settings > General are for that.
Not sure what’s going in with your situation, though, sorry.