To view the license activity of a User you can select the dropdown menu beside their name and choose "Show License Usage". This will then show any licenses the User currently holds. The Team's Admin can then choose to withdraw the licenses in use, if they need to.
The "Show License Usage" dropdown entry beside each of the Groups will show the license usage within the selected Group and the Teams Admin can choose to withdraw the licenses.
The dropdown menu in the Licenses column will show the license usage for all Users in the Teams account:
If a User is unsure if the licenses they are using are from a Teams account or not, they can view them in the Licenses tab. Each license will detail if it is from a Team.