If you'd like to remove students from the Dropped column of your Playground dashboard, you'll need to delete the student all together. Start by opening the enrollment funnel by clicking onto the Enrollment Listing from the Enrollment tab of the Admin Dashboard.

Click onto the student in the Dropped column that you'd like to delete. This will open up the student's specific Enrollment tab.

Click on the Settings tab and then click the red "Delete" button. Confirm you'd like to delete the student by clicking "Delete student". This will permanently delete the student from the Dropped column and the dashboard.