Not public; private or non-public—kept closed or secret (not made available to the public).
このページは会員限定で非公開になっている。
This page is private and limited to members only.
その会議は関係者のみ非公開で行われた。
That meeting was held behind closed doors for insiders only.
SNSの投稿を非公開に設定した。
I set the social media post to private.