@c1vl0
Hi, welcome to the community.
It does not support disabling the HTTP web log-in on Deco yet.
You could try to edit the settings on the browser, such as "Enable HTTPS-Only Mode in Google Chrome".
And since our web access uses a self-signed Certificate, some browsers might recognize the tplinkdeco.net as "unsecured" but the login access still uses TLS v1.2 and the connection is pretty safe. For more details, please refer to the explanation here: https://community.tp-link.com/en/home/stories/detail/1188
Thank you very much and best regards.