The MAX User Activity report (MAX > Mediation > Analyze > User Activity) delivers daily analytics on your audience and ad engagement for each ad format. You can Filter data. You can also choose from the View by options to create different views that help you visualize more granular data. Select Chart to see a visual representation of your app performance, or select the Table view.

When you optimize for high yield IMPDAU in ad formats like interstitial and rewarded video, keep a close eye on ARPDAU. AppLovin recommends that you balance the number of interstitials shown per user and implement frequency caps in the MAX ad unit page. This optimizes the experience.
“What is ARPDAU?” from AppLovin’s Blog