I have an issue with my Solus Xfce laptop. Today I updated all my computers, and Discover got installed in all of them. However, in my Solus Xfce laptop, Discover doesn't feel responsive, and takes a long time to start. Besides, Discover opens in light theme, whereas Xfce is in dark theme. I suppose that there must be a way to change Discover to dark theme, by modifying some file, but I don't know which one.

For this reason, I decided to install Gnome-Software, and uninstalled Discover and its dependencies. The problem is, whenever I reboot my laptop, Discover gets reinstalled again. I suppose it must be the script, it detects that I have Xfce, and it reinstalls Discover.
Is there a way to stop Discover from getting reinstalled?
Is there a way to make Discover adopt a dark theme in Xfce? This is curiosity, because I think I prefer Gnome-Software over Discover.
Thank you in advance