Hi! You can't remove the PIN or password because your email account is linked to Windows. If you don't want to use either a password or a PIN, you should sign in with a local account.
- Instead of using the PIN, you can use the password by clicking on Sign-in Methods > Key (Password) icon > You can use your Microsoft account password.
- Open Windows Settings > Accounts > Your info > Under Microsoft account, click Sign in as a local account.
- Click Next > Enter your email or Windows login password.
- Enter your user information > Next > Sign out and finish.
- After unlinking your email account from Windows, restart your PC > When it starts, relink your email account.