Management of device’s

The only way your AppleID can be "linked" to another device is by entering your AppleID and Password on that device.

You can manage devices on your AppleID at https://appleid.apple.com/

Also see the following:

If you think your Apple ID has been compromised - Apple Support

-and-

Checklist: If you want to see if anyone else has access to your device or accounts - Apple Support

Lastly, if you're not enrolled in two-factor authentication, you should seriously consider doing so.

Two-factor authentication for Apple ID - Apple Support

What do you mean? Why do you believe that you are "linked?"