I don't think you can enter it in the Expenses section of the online version of turbotax2021, but thankfully there is a workaround:
Enter repaid salary as a deduction. To do this, go to "deductions", then "other deductions", then "miscellaneous deductions", click continue, then you will be brought to a page that says "additional deductions". At the bottom there is a blank field where you can enter an additional deduction, go ahead and write "repayment of salary/wages" and then the amount in the adjacent field. I did this and my Return was assessed successfully.
