Starting in 24w33a (first 1.21.4 snapshot), The pie chart has been modified to now adapt to different GUI scales whereas the previous versions (1.20.1 and 1.21.1 as examples) assume that the pie chart should always be 1x which causes it to be tiny and worsens on monitors that have greater screen resolutions.

The bug report can be observed here.

I looked into this, but doing it cleanly appears to require rewriting the pie chart code, as I couldn't find a simple way to just scale the output from the original code (they hardcoded the window coordinates in a lot of places). I think that's too much work to justify doing in ModernFix itself, since it's purely a cosmetic change, so I'm going to reject this enhancement request, sorry.