It is possible to mark users for monitoring or mark special users, and this characteristic can be activated in the Desktops list, as well as in the "My Company" section.
In the "Desktops" section
Select the desktop, Execute operations/Assign flags and there, you select the flag you want or the Unassign flag option to unassign a user with a flag.
The result is as follows:
In the "My Company" or "Tenant Detail" section
On the "Users" tab, you can select one or more users and then click on "Assign flag" to assign or unassign the flag to the user(s).
The result would be as follows: