See https://www.zabbix.com/documentation/4.0/manual/web_interface/frontend_sections/administration/authentication .

1. The tables use form "Case-sensitive login", even though the interface (also seen in the screenshots on the page) uses "Case sensitive login".
2. The page does not clarify that this only applied to username (presumably), not the password.
3. The HTTP auth table says "Note that with case-sensitive login disabled the login will be denied if multiple users exist in Zabbix database with similar alias (e.g. Admin, admin)", but such a note is not present for LDAP. If LDAP auth really operates differently, that would be great to have explicitly mentioned.
4. The sentence that ends with "login will be denied" is missing the trailing dot.