If your distro ships it, just go to Settings > Themes > Style and select the one you want. If your distro doesn’t ship it go on Advanced Settings > Add/Remove and then you should be able to find it there (you can also manually get the theme and decompress it to ~/.themes if it isn’t available in the theme repository)
so how do i change it back without downgrading
If your distro ships it, just go to Settings > Themes > Style and select the one you want. If your distro doesn’t ship it go on Advanced Settings > Add/Remove and then you should be able to find it there (you can also manually get the theme and decompress it to ~/.themes if it isn’t available in the theme repository)
Changing themese does not change the dialogue menus and popups