So, this is not a feature request, since I know what is going on and do not really care. 😆
But a place where you might want to add some messaging.
I am still experimenting with how best to use the App, and I was experimenting with whether to use the System Calendar and Outlook integration, when weird stuff started appearing.
1) In Windows Settings -> Privacy -> Calendar, if WorkingHours is listed as "Off" (no permission), then in the WorkingHours app Settings attempting to turn on/off the selection to integrate with System Calendar will simply make the app window blink. The selection stays Off and never changes.. I know why of course (no permission to access Windows Calendar), but you might want to add some messaging to let other users know why that selection is not working and where to go to fix it.
2) Whether WorkingHours Calendar integration is On or Off, if you go to Windows Settings -> Privacy -> Calendar and turn WorkingHours Off (remove permissions) while WorkingHours is running, then WorkingHours immediately crashes. Oddly enough, this happens whether or not integration is actually enabled or not. It simply does not like when Windows suddeenly takes permission to read the calendar away. 😆