I have been using ankimobile for a while now but I recently tried to study on my windows 10 desktop again. Unfortunately, my original answer options have been replaced with pass/fail options. I did not download the add on for this and it doesnt show up in my add ons list. I tried to download the pass/fail add on and then disable it and delete it but this did not restore my original answer options. The good/hard/easy/again choices are still present on my phone app but not on the desktop.
If you’re only seeing pass/fail, it’s almost certainly one of the add-ons you have installed.
The addon sounds similar to Auto Ease Factor.