There is no supported way shown here to manually remove a stale Family Safety tracked PC from the child’s linked devices view.
Supported steps to try are:
- Verify the child account on DESKTOP-2
- On the child’s Windows account, go to Start > Settings > Accounts > Verify.
- If Verify is not shown, open Microsoft Edge on the child account and complete verification at https://aka.ms/familyverify.
- Confirm the child is still a Standard user
- On the PC, open Settings > Accounts and make sure the child account is not an Administrator.
- This matters because administrator access can change or break Family Safety settings.
- Restart the device
- Use Start > Power > Restart.
- Make sure Windows is fully updated
- Go to Start > Settings > Update & security > Windows Update > Check for updates and install available updates.
- If limits or tracking look wrong, remove and re-add the limits
- Family Safety guidance specifically recommends removing screen time limits and adding them back to clear glitches.
- If the old device still remains listed, contact support
- Go to Contact Microsoft Support, enter the problem, select Get Help, and then Contact Support.
A related Microsoft account devices answer also states that linked devices are connected automatically and there is no way to force that process. That aligns with the stale device entry not having a user-side removal option in the material provided.