The theme can be changed and displayed to only logged in users.
The visitors of the website see your old theme while you are testing the new one.
Only the administrator of the WordPress site sees the new theme that can now be tested safely.
You can also use this plugin instead of “Theme Test Drive” plugin.
이 플러그인은 다운로드 가능하며 워드프레스 독립 호스트 설치에 사용할 수 있습니다.