Private videos and playlists can only be seen by you and the people you choose. Your private videos won’t appear in the Videos tab of your channel homepage. They also won't show up in YouTube's search results. YouTube systems and human reviewers may review private videos for ad suitability, copyright, and other abuse prevention mechanisms.
Sign in to YouTube Studio.
From the left menu, select Content.
Hover over the video you'd like to update. To see your live uploads, select the Live tab.
Click the down arrow under "Visibility" and choose Public, Private, or Unlisted.
In your Video edit section change the Visibility from Public to Private