I am trying to change my GTK theme via gnome tweaks buy that is no actual option to change the Theme via the appearance tab. I believe it is now listed under “legacy” and while the command line lists that my GTK theme is indeed changed to Material Black (the one I downloaded) the system windows still look like the default system settings. What is going on here
Have you installed the gnome-themes gnome extensions ? Once installed you can change the theme. Notice that shell theme and app themes are not the same thing. Also, notice that you need to take a gtk theme that supports gtk3 and gtk4 if you are using recent gnome
Allegedly I am using the right one. It works to change the Gnome shell but not the GTK themes