When you go to the course Administration > Users > Enrolled users, near the top of the page, just under Participants, there is a drop down list of filters. Select the for, Status: Active, and all those, Suspended users, will not be shown. There are other filters you might want to try out, too.
General help
3.4 Roster issue with Suspended users
This discussion has been locked so you can no longer reply to it.