"How do I hide wp-admin" is one of the most-searched WordPress security questions, and most answers give the same advice: install a plugin that renames your login URL. That advice isn't wrong. It's just answering a smaller question than the one being asked.
Source: [Dev.to](https://dev.to/cifi/renaming-wp-login-isnt-the-same-as-making-wp-admin-disappear-2gg8)