Posting the solutions occurred thru my experience with Microsoft 365 (admin, compliance, security), SharePoint (Admin & Migrations), OneDrive, Teams, Office 365 Integrations, etc.,
In Windows 11, To unblock multiple files in the same folder, go to the folder and right click, you will see the menu as shown below.
Select Open in Terminal,
Copy/paste the following command and press Enter: dir | Unblock-File