I want to limit access for specific users to the Mentions menu only, how can I do that?

Go to the Users list and click on the Permissions button near the specific person e-mail address. Switch off all of the options except the one called Mentions.

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Hint!

If you don’t want to manually set this up for every user, create a Role. Save it with a proper name, for example “Mentions access only” and then easily assign it to the users.