Sweet, thanks! The file file is redhat-main-menu.png, and it is in /usr/share/pixmaps. What about the trash can icons? Do I do it the same way, or is there a way to do it in the themes?

Any menu-bar item that you’ve placed on the Bartender Bar works just as if it was still on the main menu bar. The Bar autohides when you click in another app or press its keyboard shortcut again.

If, for some reason, the main menu continues to load infinitely, it could be worth doing a complete system reboot: exit out of Apex Legends and restart your Xbox One, PlayStation 4, or PC.