Help, cannot mask joined sub tools

Before 1.85 you was able to join 2 subtools And you could mask one if needed and work on the other.
But now it just masks the both join sub tools.
You used to be able to just tap the screen and it would mask,…:confused:not now.
At the moment, very disappointed as my entire work flowers now pretty much back to Learning Nomad again!

Update Nomad