Hi there, jandrfriesen!
If the transfer is entered in QuickBooks, you cannot change it to a check or expense. You'll want to delete it and create a check or expense instead.
If this is an online bank transaction showing as a transfer, you can click it, click Categorize and choose an expense category. This will let you add the transaction into the bank register as an expense, but no option for a check.
If you have additional questions, you can always go back to this thread. Have a good one!