Citrix Workspace App on Ubuntu 21.04 with Wayland
I discovered with the default session switching to Wayland that grabbing the screen no longer works, so everytime I hit the Super key it activates in the host instead of inside Citrix.
I got around this with two settings
gsettings set org.gnome.mutter.wayland xwayland-grab-access-rules "['Wfica']"
gsettings set org.gnome.mutter.wayland xwayland-allow-grabs true
For any other apps similar apps, I used this command to figure out what to put in the access rule. Run this in a terminal, then click on the app:
xprop WM_CLASS