Hi @G, Sarah ,
I tested this behavior in OneNote and can reproduce with timestamp in OneNote. It seems that there is no option to disable or optional this feature in OneNote.
I suggest you can provide a feedback from OneNote app and send to Microsoft:
Microsoft is committed to continuously improving your experience with our products. We listen to all feedback and consider it for future releases. Your feedback helps us know which features are most important to you.
As a workaround, you can use Ctrl+X and Ctrl+V after screen clippings.
Hope it's helpful.
If the response is helpful, please click "Accept Answer" and upvote it.
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.