Manage a member’s content in the Xbox Family Settings …
https://support.xbox.com/en-US/help/family-online-safety/family-settings-app/manage-child-content-in-the-Xbox-Family-Setting-app
Open the Xbox Family Settings app, and then go to Settings. Select the Multiplayer tile, and then select the toggle switch to block or allow multiplayer features. Members may request to play a game online with their friends for a specific title. When you receive this notification, you can approve or deny the request with the following steps:
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