Hi Noah,
Thanks for posting in the community. We are happy to help you.
Regarding your query, it is possible. To duplicate a row, you can click "Edit in grid view", select all fields of one item, press Ctrl + C, click "Add new item", select all fields of the new item, press Ctrl+ V, then click "Exit grid view".
We look forward to your response. Thanks for your cooperation.
Sincerely,
George | Microsoft Community Moderator