@Toomanyrooms 

You could use Automations - Let me know if you want specific detail but here they are:

      1. Turn on notifications for cameras x y z (where you are not) and turn off notifications for cameras a b c (where you are now) - IMPORTANT - you must set multiple actions controlling each individual camera for the notification option to come up

      2. Vice Versa.

You could set the trigger to the Automations a shortcut which you add to your home screen.

Hope this works!

@ igoboom,

Thanks very much for that tip. I'll investigate Automation.

Cheers, Toomanyrooms

@ Wayne,

Thanks for that. Having a good explore of the app, if I go Me>Notifications>Management>Notifications, my camera (and movement sensor, whch I'm also wanting to control) is listed there, so it looks like I can manually switch off the notifications there, admittedly each one at a time. That will suffice for the time being.