Crossfades Greyed Out + Prefs Issue

Hi; I’ve got that issue where the crossfade function is unavailable. Starting with prefs disabled or deleted does ‘fix’ the problem.

My issue now is that so many pref details need setup, it would take me hours to remember everything and get it set up again.

Is there a way to find the pref file causing the problem and delete just that?

Or any other advice?