The original GNOME Fallback session that shipped with CentOS 7 and CentOS 8 were legitimately fantastic stuff... but unless I'm horribly mistaken, GNOME Fallback no longer exists. I would've never attempted fiddling with Dash2Panel if the GNOME team, in their infinite "wisdom," decided to nix a genuinely useful alternative to GNOME Shell. I didn't need GNOME Tweak Tool to give me back my minimise and maximise buttons on the Fallback session. I was able to do much more and have a great time doing it in the fucking fallback session. Why they nixed it is beyond me.