I have hidden both the menu bar(at the top) and the status bar(at the bottom) in Whonix Gateway, how do I restore them? Thanks
You can use the same mechanisms as if using Debian with Xfce. You need to learn Xfce. Maybe useful search terms:
unhide taskbar with Xfce
restore taskbar with Xfce
Can be resolved as per:
Unspecific to Whonix.
Or a lazy shortcut: factory reset
(Whonix is based on Kicksecure.)