Question Pause Execution of Update

Hello, I am developing a project for HoloLens2 with OpenXR. The problem is when I stop and deinitialize the openxr Unity completes the rest of the update function and then never starts back. So after I stop and deinitialize the openxr I want to pause the Unity's main loop and when I am done I will move on from the place I stopped and execute start and initialize back again.