For clarity, I think it would be more correct to rename the "Preferences" tab to "Sources", because only the sources of the software installation repositories exist there. I have seen a bug about this (Bug 389717) and it seems that it was considered appropriate, but the bug is closed and Discover still shows "Preferences". What happened with this? Thank you!
Heh yeah, I proposed that, but ultimately it got reverted for some good reasons: there are in fact preferences in there. Click the three-dot kebab menu in the upper-left corner. And on some distros there are even more, as distros can integrate a way to launch their own settings windows from here. So I think we have to keep it the way it is, sorry.
OK, I understand. I hadn't seen that menu until now. In addition, there is also the update frequency configuration, very useful :-) Thanks for your clarification!