Do you have external reports where you want to control their visibility in the Metric Insights mobile application? For example, maybe there are external reports that link to Tableau and you, as the admin, do not want users clicking through and launching Tableau on their phones. 

If this is the case, then you can do this either from the ADMIN section after the external report is generated or directly from the Report Editor.

Tip: When you configure external reports to not be shown, they will not appear in the mobile app even when searching.