Hi there, Audacity has a serious issue with HDPI.
Kubuntu: 20.04.3.
Audacity: Unoff./Off. PPA (Audacity 3.0.2) but even with latest Appimage.
I attached the screen to show you all how tiny things are. Even the “about” dialog is tiny.
QT_SCREEN_SCALE_FACTORS=2 doesn’t solve the issue.
Kdenlive has a similar issue but with the Appimage works fine.
If i upscale 200% icons are immense and everything is messed up.
Looking forward a solution.
Cheers!
Audacity does not yet fully support HDPI, but on xfce I can get a reasonable view by increasing the font scaling (using “xfce4-appearance-settings”)
The developers are aware of the hdpi issue and are working on improving it.
I used XFCE on my laptop it is a very good UI but on my main PC I recently switched to KDE that has a very good and solid “global screen scale” working very well (actualy is 175%). Audacity is the only app I have with this “big” problem. 
Ok, I will wait but - sorry and I don’t want to sound rude - even if I am not a programmer I don’t think having a “scale factor” inside an application would be an option to much difficult to code 
As you say, you’re not a programmer 
- scaling a complex WxWidgets based app like Audacity is very difficult.