Translations:Social/80/en
From VRChat Wiki
If you wish to prevent other users from seeing your mutual friends and groups or appearing as so for others, you can turn off "Show Mutual Connections" in the Comfort & Safety section of your settings in the Main Menu. Doing so will change the text of the button from "Show X Mutuals" to "No Known Mutuals". Additionally, your user icon will be hidden, and your username will appear as "Hidden Mutual" when you appear in the mutuals in one of your friends.
