Sign in to YouTube with your Google account
Click your profile picture
Select YouTube Studio
In the left menu, click Settings
Click Channel
Open Advanced settings
Set your channel visibility or content access as needed
To make videos private, go to Content
Select the videos you want to hide
Click Edit
Choose Visibility
Select Private
Save changes
To make playlists private, open the playlist
Click Edit
Change playlist visibility to Private
Save changes
To limit who can view a video, share it only with specific Google accounts
To keep uploads private by default, set upload defaults if available
Review your channel homepage and remove any public content you do not want visible