the "☑ ️ Show Admin badge in my profile" checkbox does not affect admins themselves
for the logged-in admin, the [Admin] badge is always shown, regardless of checkbox state
but this setting is saved on the server, and correctly displayed on the settings page, across multiple logins, which is already half the effort
upd: i had to logout and clear cookies & cache to see it working on my own profile, so i'm narrowing the issue
Edited by Ghost User