After you cancel the amended return you have to manually take out the changes you made to put it back to the original return. You should have made a copy of your original return before you started amending so you can go back and start over.
How to cancel or undo an Amended return
https://ttlc.intuit.com/community/amending/help/how-do-i-cancel-or-undo-an-amended-return-in-turbota...
