You can hide suggested contacts from the Discover Tab individually or in bulk. Contacts that are hidden in Top X or Last 30 days will no longer be visible and can be found in the Browse all tab.  

To hide suggested contacts individually, tap on the ellipsis and choose Hide Suggestion. Another option is to tap on the contact card and at the bottom of the screen tap on Hide from Top X.

To hide suggested contacts in bulk, start by tapping on the contacts avatar. You will find a new navigation menu at the bottom of the screen. Tap on the Hide icon.