Today I opened Little Navmap and discovered that all windows font is so small I can´t read them. I update to 2.8.11 with same result. Almost unreadable. Icons is as before. I don´t know if it is a windows 11 problem or Little navmap that cause it. No other programs do this. I tried to reset fonts in options but still small. I show you a screenshot maybe someone has seen this before me.
I use Windows 11 22H2 version 22621.1848. Before this version it worked fine.
You could try contacting them for support:
Today when I opened Little navmap the fonts were back in it´s normal size?! I have done nothing since yesterday when I discover the problem. Spooky. But now it seems to be ok again.
Problem solved but don´t know how. 
This happens to my system every couple of weeks and it is only solved with a reboot. I have now made the habit of starting LNM when I start my computer, even if I’m not flying right then, and if I get the little font thing I just reboot. I’m hoping it gets fixed one day and I should really report it to the LNM team.
This was the first time ever for me.
Did you update your Nvidia driver and didn’t reboot before running Little Navmap? If so, that’s the issue which a simple reboot resolves.
I can´t remember since it was some time ago. I think I restart. I don´t open Little navmap that often. But it is working now.