I use Zenmap (nmap gui) on an older stand-alone Kali install. This new Kali distro does not have it but it was easy enough to add following this guide. Zenmap -- Easy GUI version of Nmap
on edit: the guide is incomplete for Kali 2021.
After install, the template appmenu is populated witih Zenmap, but clicking them only gives you a flash of a window and then nothing.
I tried to launch Zenmap from terminal and this produced many dependency errors. Zenmap was not starting.
SOLVED- Kali dropped Python 2 in favor of Python 3 and Zenmap in its current incarnation depends on Python gtk2 module. I had to install Python gtk2 and its dependencies . Now Zenmap works like a charm.
BTW, Qubes 4.1 is really much more compatible (and stable) with my Dell 5520 with Xeon e3-1505, than any of the previous Qubes versions. I’ve used Qubes on this machine since Q3.1
Thanks to the Qubes team and the community for this excellent OS