As soon as a new user joins the program and accepts their invitation by creating an account, they'll be marked as Active. View the gif or read the guide on how to make these changes.
Gif
Guide - Inactive
Click on the Admin Settings module.
Select the All Users tab.
Click in the name of any User with an "Active" status to their profile, to open their detail card.
Click on the More icon (...).
Select "Make inactive" from the dropdown.
From the "Make user inactive" window, select "Make inactive" button to confirm changes.
The user is now revoked from logging in and will appear in the program.
Guide - Active
Click on the Admin Settings module.
Select the All Users tab.
Click on the name of any User with a profile status of "Inactive" to open their detail card.
Click on the More icon (...).
Select "Make Active" from the dropdown to open the "Make user active?" confirmation window.
Select the "Make active" button to confirm.
The user is now able to log into the program again and will appear as Active.