I was surprised to read that minimal might combine with columns-n in Collect so I tried it out. It seems to partially work but in my simple form select_apps.xlsx (9.5 KB) labels aren't displayed correctly. I think it might be be a bit of an accidental feature. I've always thought of minimal as "taking over" and leading to other appearances other than autocomplete being ignored. That's not from the documentation or anything, just my own assumptions!
In Web Forms, minimal choices are in a drop down. What kind of presentation would you expect? Still a dropdown but multiple choices on each row? What's the use case?
This is an ongoing challenge that goes beyond appearances! So many form definition features can combine in interesting and sometimes surprising ways. We try to test as many combinations as we can but we definitely have gaps. We appreciate everyone reporting combinations that don't work as expected!