Not sure what I’m missing here, but I have the Tweaks app installed, I have Gnome User Themes installed.
I go to the app store, I download a theme, for instance Arc-Dark-Solid which I would assume would automatically add itself to the Tweaks menu for theme selection after installation (and reboot), but it doesn’t get added.
Fair enough, but are there any theme’s that will “just work” by downloading them from the App store? For instance, “Orchis” is a modern / up to date theme with the same issue when installing via Flatpak.
Theming Gnome can be a bit tricky. When done right it looks great but it takes a few steps, and sometimes a new Gnome version can break your themes.
As for a simple just work, there was Gradience but it’s no longer maintained.
I ended up making my own theme.
If you want to know more I can walk you through it.