I write because you write before this
But on windows on 4k screen all midi plugins that you write with own code are too small. only main window is scale correct. plugins that support correct scaling are correct(see scaler in this screenshot). only the window title is too small. and the popup menu is too small in your code,
here is a screenshot that show more of your own written unify plugins that are too small.
it seem the forum scale my 4k screenshot down, to 1920. I hope it is now clear what the problem is.
All plugins that support scaling are correct in juce/unify. all plugins/or childwindows you have written support no scaling and are too small.
so you need a solution hat your own unify plugins or child windows are scale to correct size
that juce/unify show old plugins that not support scaling too small is another thing