Custom notification size on iPhone I would like to receive customized notifications from any specific app on my iPhone so that I can never ignore it because they are super important. 

One solution I thought of is to show notification as a popup on the screen while using the iPhone or show it large size when phone is locked. I'm not sure how to implement it.

Any suggestions?

Thanks

PS: I have also supervised my iPhone through MDM.
Not resizing, but you can set the banner to be permanent/ persistent instead of temporary in Notification Settings.