Additionally, I would suggest testing whether the issue is specific to your Windows profile:
- Go to Settings > Accounts > Other users.
- Select Add account > Add a user without a Microsoft account.
- Sign in to the new account and check whether the box still appears.
If the box is gone in the new account, this points to something within the original user profile rather than a system-wide display issue.
If it appears in both accounts, please let us know your Windows version/build and whether the box is visible before you sign in to Windows. That will help narrow down the next step.
I hope this helps isolate the cause, and please feel free to share the result so we can continue from there.