[pjc50]

Could you suggest an example such application we can try / look at screenshots of?

(I've been aware of Qt for like two decades; back in the early 2000s my employer was evaluating such options as Tk, wxWindows, and ultimately settled on Java, I think with AWT. Qt seems to have a determined survival niche in "embedded systems that aren't android"?)

[rubymamis]

I would plug my note-taking app written in Qt C++ and QML: https://get-notes.com.