It sounds like you maybe have installed both pamac and discover. Neither of these are installed by default in EndeavourOS.
Discover, in it’s default state, is perfectly safe to use as it will manage plasma components and flatpaks. It only becomes problematic if you also install packagekit-qt5. In truth, it isn’t Discover that is really the problem, it is PackageKit itself.
Are you talking about the widgets? They are probably installed by a package which is why Discover doesn’t show them as installed. They are probably part of the package kdeplasma-addons but removing that will remove other widgets/plasmoids as well.
There really isn’t much reason to actually uninstall those. They don’t run unless you use them and the take up very little disk space.
thanks! In the meantime I uninstalled all de’s present apart from Gnome and only Music remains as well as org.gnome.Software which does not seem to work but does not bother me as I use yay in terminal.
No, not at all. You only need to understand a few very simple concepts: qdbus, Activities (and how they differ from virtual desktops), Window Rules and the difference between Special Window and Special Application Settings, Kate Sessions, Konsole profiles, how widgets are installed… You also need to know not to use Discover on Arch, and to be able to navigate the labyrinth that is System Settings.
I don’t even understand this and i find KDE very simple. I don’t mess with stuff! It’s that simple. I don’t try to change it into something else. It’s Kde Plasma…what more do you need! Install it use it!