The option to “discard” suggested contacts in your chat list is rolling out to users. We will be making further changes to make suggested contacts more relevant for new users in the future as well, so marking as partially completed. Thanks for your patience with this one.
~Alex & the Teams teamAnonymous commented
Please allow a feature to remove suggested contacts. Why keep indefinitely? There are dozens of reasons to allow users to remove contacts, no reasons to not have the feature and control for the user.