Sublime LMS ™ automatically creates a sortable user name using the Last Name, First Name convention. Admins can edit and change a user's sortable name, if needed.
In Global Navigation, click the Admin menu [1], then click the name of the account [2].
Locate Find A User on the sidebar. Type in the user's name [1] and click Go [2].
After clicking Go, you will see the search results. To access that user's details, click the name link.
Type the name as you wish it to appear in the Sortable Name field. Click the Update Details button when you are finished.
The user name will now sort properly based on the changes you made.