Here is a suggestion I have, after coming across this issue now several times.
Currently I can only see how “full” a system is by being in the note spacing tool (which is fine). However, there are times Dorico is filling systems to only 47%, 53%, etc. I would like to maybe combine two of these system using the “make into system” tool. The issue, is that I need to keep switching back and forth to see how full a system is, to see which ones I might consider forcing together, or moving bars together, etc. It would be nice, if I could see how “full” a system is without having to constantly with back and forth between tools.
Maybe some sort of a toggle?