Deleting your student loan goal and unlinking it from your loan account will send any funds in the goal back to your connected checking account.
Removing the student loan goal via the Digit app:
1) Open the app and tap your student loan goal
2) Tap “Settings”
3) Tap “Delete” and confirm
4) The goal will be closed, similar to a normal goal, and anything saved towards it will be transferred back to your connected checking account.
If you have any saves that are pending at the time you cancel that goal, those saves will first have to post to Digit but will then be automatically returned to checking.