Go to Items.
Press the edit icon to the right of the product you want to add/update the visibility of.
Under WEB STATUS (or the name you gave web status attribute), select HIDDEN or INVISIBLE.
Scroll down and press Save.
Make Product Invisible Online
If you want to hide a product from your online store, the first thing you need to do is create the web status attribute. Once you completed this step, you'll be able to make a product invisible.