I ran into an interesting quirk: I'm symbolizing a layer based on two fields. The first field has a coded value domain where the values contain spaces. If I try to add a new value to the legend, e.g. "Farm Gate (06),1" Pro wants to put a comma after each word: "Farm, Gate, (06), 1". Is this a known issue?
FYI, I was able to work around this by symbolizing on an Arcade expression:
Replace(Concatenate([$feature.TYPE,$feature.WORKFUNCTION],'|'), ' ', '_')
Then I can add a value such as "Farm_Gate_(06)|1".