When hiding titles from your Netflix viewing history: They will not appear on Netflix as a series or movie that you have seen.
They will not be used to make recommendations unless you watch that content again.
They will be removed from the Keep Watching row on your Netflix account.
How To hide titles from your viewing history
In a web browser, go to the Account page.
Open the Profile and parental controls section of the profile you want to update.
Open the Profile View Activity.
To conceal an episode or title, go to the Activity page and click the hidden symbol next to it.
When you hide an episode, you will be given the option to hide the entire series.
If you want to hide your entire viewing history, select the Hide all option that appears at the bottom of the page and confirm your choice.
The titles you have hidden can take up to 24 hours to be removed from all devices. Titles cannot be hidden if the Activity page is accessed from a Netflix Kids profile.