Since I was irritated by the qubes gui regarding the memory usage of its qubes as well as the outputs of xentop I had a look into the topic and ended up with qmemman and xenstore.
The widget displays the actual memory used by each domain as well as the dynamic targeted value for memory allocation by qmemman and the max value.
Since "new users can not upload attachments" - I put it on pastebin
(thanks and hate to Claude for creating it with me)
Edit: widget.tar.gz|attachment (1.1 KB)