For mobile would be nice to be able to specify between All Items, the Groups tab, or one of the categories to display by default upon launching the app itself.
As mentioned before I am just a user but looks like you could try to save a new backup from the successful one you imported as a totally new backup file then try the new one? Just an idea though.
Try iOS settings and entering the Face ID & Passcode section then try in Enpass again. I have had that allow Face ID work in other apps again after messing up before in other apps after correctly going into that. So maybe that will work.
Just another Enpass user so your mileage may vary with above tip.
Carroll D.