Yes, you can change the expiration date for class makeups for all students at one time!
If your makeup policy is to give students a specific time frame to make up their missed classes, the default setting in Tools > Edit Settings > Organization Defaults (left side) > Makeup Settings needs to be changed. Go to Organization Defaults and select a longer expiration time period for the makeup classes. You also have the option of selecting No expiration. They can always makeup a missed class. These default settings can be changed and updated at any time.
Once the Makeup Settings are selected click Save Changes and enter the date range for the absences in the pop-up window. Click Yes, update Makeup Expiration Dates and you will see a Success! message and a list of the number of absences that were updated:
Go to Makeups - An Overview for more information.