If you have deleted a staff member and they still have appointments, their column will show up with the title "Deleted Stylists". 

You aren't able to surface the modal for bookings in the Deleted Stylists column, so in order to delete them, you'll need to drag and drop the booking into another column:

Once the booking has been moved out of the Deleted Stylists column, you can click on it to surface the modal as normal and then click the 3 dots for Delete Booking:

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