Q. How do I renew a downloadable?
You'll see the Renew option for a title on your three days before it expires, as long as there are no holds. If the title has holds, you can't renew it, but you can request it again.
In the Libby app, find the Manage Loan button for the title in your shelf. That's where you'll find the option to renew.
In the OverDrive site, go to the Loans page and find the title; look underneath the download buttons for the option to renew. More information from OverDrive help