Administrators have the option to remove a card set from a user's assigned sets. When that happens, the user can no longer view the removed card set on their app.
To do this as an administrator, sign in to your TalentCards account, go to the Users (1) tab and click on the user's name to open their activity page, where you can see all the sets assigned to them. From there, you have two options:
Click on the Unassign button found next to each set (2)
Select more than one set, click on the triple-dot icon on the sets bar and hit the Mass Un-assign button to remove them at once (3)