Something going wrong with key signatures?

Hi, so I was just playing around with MuseScore 4.3.0 but I found 2 problems:
1. In the key signature's 'More' menu, there seems to be no tab for custom signatures unlike in the previous
versions.
2. When I try to use a custom key signature followed by the C Major key signature, there isn't any naturals but
it still changes properly.
I want to know why is this happening, so can someone tell me if we can add custom signatures now and if yes, then how.