I've been away from my Monitor One and have resumed testing it. If my memory is correct there is some user button presses that will 'stop' the edge app but I can't seem to find it now. Was thinking it was two short button presses but that doesn't seem to work for me. My apologies for this post but my old memory isn't working well and my searches haven't produced the answer.
@icole there is no button to "stop" the edge app from running but you may be thinking of Safe Mode where the Monitor One reboots and doesn't run the user application (edge). You get the Monitor One into Safe Mode by pressing the Mode button then flicking the Reset button while keeping the Mode button pressed until the RGB LED is flashing magenta (purplish). The Monitor One will then connect to the cloud (but not run Edge) and be ready for an OTA update.
If you are programming via USB, you can put the Monitor One in DFU mode by doing the same button press sequence as Safe Mode but holding the Mode button until the RGB LED is flashing yellow. Again, Edge will not run and you can use Particle Workbench to upload new code via USB.
I found that pressing the mode switch two time quickly does what I want. My memory of two quick button presses seems to be correct, just my memory of which button was incorrect.