If you are not finding this listed as an Admin app, and we're assuming that you turned off "allow this app to appear over other apps", I'm going to have to say this is an app issue. It was just designed this way. I doubt there would be a setting in the app that would prevent this, mostly because I can't think of how it would be worded, I mean what would it say "allow me to close the app without acknowledging the pop-up???", but checking the app settings would be my next step. If this is a notification you probably have a range of notifications that you can enable and disable in the notification permissions of the app page. With Samsung that should be something like Settings>Apps>Uber>Notifications. There you can see all of the categories the app developer has given you control over and perhaps you can pick and choose which notifications you want to receive and cut down on the occurrences of the ones you don't, thus at least limiting the annoyance. That would be step 2. Step 3 would be contacting the app developer and trying to leave a recommendation. Recommendations are like wishing stones, some times you get lucky but usually it just makes you feel better.