I needed to logout of Netflix on the Smart TV box I’m using here at home, so that I could watch on my computer, I share this account with someone, and I finally found how to do it on this site, which worked for me and may work for you too.

It says:

If you cannot locate Settings or the Gear icon:
From within the Netflix application, use the arrows on your remote to enter the following sequence: Up, Up, Down, Down, Left, Right, Left, Right, Up, Up, Up, Up.
Select Sign out or Deactivate.
You will now be given the option to sign in as a different Netflix member.