How to get rid of This has been set by the MB_LDAP_ENABLED environment variable

I took over the metabase and found out that the authentication page for LDAP was blocked with the following " * This has been set by the [MB_LDAP_ENABLED] environment variable.“

I tried to disable that by setting MB_LDAP_ENABLED=false, but it does not show the web UI.

is there anyway to make the web UI reappear?