Hi!
Welcome to Microsoft Q&A forum.
I'll give you steps on how to leave a Family group.
- Go to: https://account.microsoft.com/family
- Sign in with your Microsoft account (the one restricted which is your account).
- Under your family, locate your name.
- Select Leave family group (you’ll see a link or a three-dot menu next to your profile).
- Then confirm
Note: If you don’t see the “Leave family group” button, it means your account is still classified as a child account. Go to the next step.
Change your birthdate (if you’re already 18)
- Visit: https://account.microsoft.com/profile
- Sign in and click Edit date of birth.
- Change your Birth year so you are 18 or older, then Save.
- Wait a few minutes, then go back to https://account.microsoft.com/family, check again if the option to Leave family group is already available.