Fwiw, System Settings -> Display has the per-screen scale settings. My wife got a 4K desktop screen for her FHD laptop a few months ago and it made us switch h

Fwiw, System Settings -> Display has the per-screen scale settings. My wife got a 4K desktop screen for her FHD laptop a few months ago and it made us switch her system to Plasma's Wayland session. Mixed DPI works fine, also dynamically (i.e. dock/undock).