MileSplit's team management system filters out athletes that have already graduated. In the event that the athlete is still showing on your roster, make sure that their grad year is set to the proper year. 

For example, if John Smith shouldn't be on your roster because he graduated in 2024, then you'll want to change his high school grad year to 2024 so that he is saved as an alumni. All grad years in the MileSplit system always relate to the high school grad year.