Hello,
I noticed when adding a user/group to a Team in Forms 11 it will filter out existing members, however, there seems to be a minor flaw in that it only filters out the visible members.
For example, if I have it set to Show 20 items, and items number 21-23 match the suggested items when I start typing, those items will all still appear in the list.
Basically, the Add menu filtering only seems to be based on what is displayed on the page, not the full list of team members.
Not really a big deal or anything, but just figured I'd point it out while it was fresh in my mind.