I have an instant app that I have to manually go into and apply the cover page when there isn't a current snow emergency. Is it possible to use a Notebook and apply the cover page if a value in a table is a certain value?
I'm not familiar with notebooks so I'm not sure if you can interact with app data that way. The configuration values for all apps are stored with the portal application item data so if you are able edit the app data then it would be possible:
https://developers.arcgis.com/rest/users-groups-and-items/item-data/
If it seems possible via notebooks feel free to reach back out and we can give you info on how to add the cover page settings to the data.