I am currently unable to UN-enroll from the Dev channel, I'm not able to select either the Beta channel or Release Preview Channel.
When I go to Settings -> Windows Insider Settings -> select a different channel, the other channels are there but there is no button to accept or confirm, there's only the back button which does not actually update the selection.
Screenshot: https://i.imgur.com/VYTfNeV.png
Am I missing something? Is there a keystroke that I need to perform to select a different channel?