As noted before, once upon a time…
Scrivener 3.1.5.0, under Windows 10, 64 bit.
The style drop down is huge, but so is the Quikc Search & Targets on the main toolbar.
It first went wrong when I was defining styles, and showing invisibles and then did F3 to repeat a search and Scrivener crashed – just disappeared (nothing lost).
Now despite “customising” I can’t get things back the way they were: the style box resets on quite/restart but the Quick Search hasn’t
Now everything has moved my muscle memory for outline, corkboard etc. is unhelpful 
Ideas?
I’d happily poke around in a prefs/json file if I knew where to look.