Open YouTube and sign in to your account
Go to the channel you want to block
Click the channel’s name or profile picture to open its page
Click the three-dot menu on the channel page
Select Block user
Confirm the block when prompted
To stop seeing a channel’s videos, click the three-dot menu on a video and select Not interested or Don’t recommend channel
To unblock a channel, go to YouTube Studio or your Google account settings where applicable and remove the block if available