Switch to KDE - then it’s trivial to organise the menu as you will -
organise groups of qubes together, or better - organise applications
from grouped qubes in to single menu folder, and lose the qubes from the
menu.
Use KDE Activities - you then have named workspaces that you can colour
code by background, so you always know where you are.
You can force windows from specific qubes to appear on a specific
Activity, so minimising the risk of mistakenly bleeding information
between qubes.
In KDE the qube name is shown on the panel, along with the description.
In my opinion, KDE is far better for working in Qubes than Xfce, and,
of course, it looks much better.
And, KDE makes working with keyboard shortcuts so much easier.
Why not give it a go?