There is another possible reason the manager feels it is necessary to have everyone on camera so that they can watch you work. It is possible that it has becom

There is another possible reason the manager feels it is necessary to have everyone on camera so that they can watch you work. It is possible that it has become obvious that the manager's position is not needed and that the employees are doing their work without the manager just fine. So they feel it is necessary to do this to justify their position.