I created a Pro project in 3.2 on a network drive. There is a toolbox and a folder in it that I don't want others to see but I can't remove them. Both show "Remove From Project" as being grayed out. Seems so basic but it remains grayed out even after restoring Pro and rebooting. I had originally added two toolboxes to the project but it let me remove one of them.
Also, the project is one I created and in a network folder that I have all permissions to.