I recently got rid of my M1 iPad Pro, so I can't verify (and you might be right).
I recall: using stage manager, plugging into monitor via USB-C, going into Settings to disable mirroring/enable as external display, ensuring you have a mouse/keyboard connected to the iPad, and then just clicking the iPad screen off with the lock/unlock button.
The mouse driven experience on iPad OS is awful. And switching between apps leads to apps suspending themselves in the background when I don't want them to. And Safari aggressively suspends browser tabs on iPad so you lose any kind of web page state.
Just dock your iPad in the office and get a desktop class experience. Pick it up and go and have your same apps and sessions and data anywhere.
Would be nice. It's the experience I had with a Surface but I get Windows isn't applicable to all users and workloads.