You can remove TV shows or movies from the Continue Watching row when watching on:
Computers
TVs
Android devices with the latest version of the Netflix app
iPhone, iPad, and iPod touch
Place your cursor over a title in the Continue Watching row.
Select Remove From Row.
Go to the details page of a TV show or movie in the Continue Watching row.
From the menu, select Remove from Continue Watching.
Tap Menu for a title in the Continue Watching row.
Select Remove From Row.