Hi @Ho Vinson,
It is not possible to hide the activity in SharePoint documents. The activity log is an important feature that allows users to track who has accessed and modified the document. If you do not want users to know who the document was shared with, you can restrict sharing to specific people or groups within your organization.
And it's recommended to share your idea in this SharePoint official feedback portal to help us make improvements in this feature. The SharePoint product team actively monitors feedback there and will take into consideration for development if the feedback is valuable.
Hope my answer helps. Please let me know if you still have any questions in this case.
Have a good day:)
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