We are planning on adding Parental Controls to Rocket League in the future. If you would like to more broadly restrict access to some features right now, you can do that with your platform.
Epic Games Store
Epic Games Store has general Parental Control settings, playtime and purchasing settings. For more info, check out the following Epic Games Store articles:
How do I set up Parental Controls for the Epic Games Store?
How do I set limits for my child’s playtime or purchasing?
Windows
With the controls Windows provides, you can set restrictions on activities including purchasing, playtime, access to content, broadcasting, and more.
For more info, check out:
https://account.microsoft.com/family/
PlayStation
Parental controls settings include spending limits, social features, and access to games, content, and the internet.
For more info, check out:
https://support.playstation.com/s/article/PS4-Parental-Controls
Xbox
Microsoft’s Xbox controls include restrictions on purchasing, broadcasting gameplay, and access to social features including communication and multiplayer modes.
For more info, check out:
https://support.microsoft.com/en-us/help/4482922/xbox-one-online-safety-and-privacy-settings-for-parents-and-kids
Nintendo Switch
Nintendo offers controls over features including purchasing, play time management, content viewing and sharing, and communication.
For more info, check out:
https://www.nintendo.com/switch/family-fun/parental-controls/