I don't understand how can a manager manage reports through the app if he doesn't have the ability to delete reports.
It seems like a basic function that has to be in the crowd-source manager app.
I very much agree. It should at least be a configurable option. An in particular, as far as I am aware, there is no good way in AGOL to delete records that don't have geometry -- you can't do it from the Map Viewer, and need to resort to listing object ID's at the REST endpoint. Hard to believe that's still the case in a professional GIS platform. A delete function in Crowdsource Manager could definitely improve many workflows.