What to do to restore the top panel?

[DVM]

Have you tried this:

Panel is gone

@Qubes_User171 should start terminal in dom0, execute xfce4-panel. Panel will show up. Then it is needed forcibly to close the terminal regardless of the warning. The panel will disappear and reappear in a flash second. It usually happens when using context menu while on panel which somehow triggers closing the panel without the warning.

and this:

Qubes 4.1 top bar disappeared

Hello, thank you for your answer. Following your guide I got an error restarting it. The solution was xfce4-panel --disable-wm-check, still I would like you to verify if that hasnt any security issues to disable WM check or should I try another way?