Probably related to #6591 (@sakertooth) as mentioned by M. Gregorius in #7045 -- when LMMS runs at 2x scale, the LED checkboxes in Mixer do not scale up its boundary and get cropped. Some of the longer labels also have a similar issue and their first letter is getting cropped.
Left: a few months old build, right: build from #7045, including the new mixer:

The mixer also takes up quite a bit more space now, fitting only 18 buses where it previously displayed 24, and leaving space for at least one less track. Not sure if that was intentional. While it does not look as crammed as before, it would be nice to have an option to switch back to a version with more compact margins. But that would be a feature request, so unrelated to this bug report.
Probably related to #6591 (@sakertooth) as mentioned by M. Gregorius in #7045 -- when LMMS runs at 2x scale, the LED checkboxes in Mixer do not scale up its boundary and get cropped. Some of the longer labels also have a similar issue and their first letter is getting cropped.
Left: a few months old build, right: build from #7045, including the new mixer:
The mixer also takes up quite a bit more space now, fitting only 18 buses where it previously displayed 24, and leaving space for at least one less track. Not sure if that was intentional. While it does not look as crammed as before, it would be nice to have an option to switch back to a version with more compact margins. But that would be a feature request, so unrelated to this bug report.