Please could you explain the problem a bit more and provide steps to reproduce the issue?

Created attachment 165312 [details]
demonstration screen

OK.This probably isn't a mistake. When I click the plus button, it actually resets, but when I click the minus button, it returns to what I had set earlier. Apparently this is the nature of the program.
edit: added screen

Ah yeah, it looks like the column settings are stored differently for each group in the main view. I guess it makes sense to either have an option to make all groups follow the same settings, or make new groups inherit their settings from the last-open group.

"or make new groups inherit their settings from the last-open group."

How to do it?

I meant that it would be a good feature to be implemented. I don't think there is an option for it right now.

Ok I understood.