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User Managers can see which users have 2-factor authentication enabled by showing the 2FA Status column on the users list. This column is hidden by default.
Right click on a user that has 2-Factor Authentication enabled to either suspend or remove 2-factor authentication.
Clicking on "Remove 2-factor authentication" will clear ALL 2 factor authentication devices from the users account.
If you choose to suspend 2-factor authentication then a new window will be shown to state when 2-factor authentication should be enabled again. 2-factor authentication will automatically resume when the time is passed.
If the account 2-factor is suspended it can be resumed early by right clicking on the user and selecting "Resume 2-factor authentication"