Hi DebJ_2022,
Please check out the information in the following link, and ensure all of the requirements to use Stage Manager have been met, and the correct process is being used, so we can make sure that's not part of the issue: Organize your Mac desktop with Stage Manager
Turn Stage Manager on or off
You can quickly move back and forth between Stage Manager and traditional windows to use the method that’s best suited for the work you need to do.
On your Mac, do one of the following:
* On your Mac, choose Apple menu
> System Settings, then click Desktop & Dock
in the sidebar. (You may need to scroll down.) Go to Windows & Apps on the right, then turn Stage Manager on or off.
* Click Control Center
in the menu bar, then click Stage Manager
to turn it on or off.
Use Stage Manager
On your Mac, do any of the following:
* Switch apps: Click an app on the left side of the screen.
* Arrange windows: Reposition, resize, and overlap windows to suit your workflow.
* Group apps: Drag an app from the left side of the screen to add it to a group of apps in the center of the screen.
* Ungroup apps: Drag an app to the left side of the screen to remove it from the group.
If you turned off “Recent applications” in Stage Manager settings, the list of apps on the left is hidden. Move the pointer to the left edge of the screen to show it.
If you continue to experience an issue, please let us know if you've received any errors about Stage Manager, as that will help us plan how to proceed.
Thanks!