Hey @Andy1980 - This is something that you will have to put in a request to Athom for.
I agree its frustrating and there is a similar issue with the engergy readings, but as you can read here : [Feature request] Excluding zones and devices from Homey Energy - Ideas & Suggestions - Homey Community Forum
If enough people ask for a feature then Athom are actually fairly reasopnable.
My advice, send it a request to Athom, but make sure its not specific to the group app.
ie. Can we please have the ability to remove a device from a light widget.
