You can hide attendees from the attendee list, search results, upcoming session reminder cards, and user recommendations.
To hide an attendee, in the CMS, go to your attendee list under Content, click on an attendee and check the box at the bottom of the page.
You can also hide attendees via the import template. Just download the template and there will be a column on the far right that says "Hide in Mobile App". Enter 'yes' to hide that attendee. Upon import, that attendee will be hidden in the app.
Note: If a hidden attendee engages in an activity which exposes them to other attendees, their profile card will become visible via that route (e.g., if a hidden user messages Joe, then Joe will see the hidden user's profile; if a hidden user posts to a Topic Channel, then everyone who enters the Topic Channel will be able to see the hidden user's profile, etc.)