Hi @Kelly ,
As a workaround, you could get all the list items in the library using this endpoint:
https://graph.microsoft.com/v1.0/sites/{site-id}/lists/{list-id}/items?$expand=driveItem
In the response, it would contaion all the files and folders in the specifice library.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.