I set scaling factor to 1.38. Menu and title bars indeed always scale properly. What's wrong is that often after I restart computer, window content or top right corner menu content are not scaled properly (i.e. with the factor I set).
What I noticed (and might be of some importance) that the window content and the top right corner menu content are scaled independently from each other - sometimes the window is scaled properly and the menu isn't, sometimes the opposite, sometimes they're both scaled well.
Is this behavior a bug? Is there something I can do to deal with it?