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 NOT SALABLE.
Scroll down and press Save.
Make Product Visible But Not Salable
If you want to make a product visible not salable, the first thing you need to do is create the web status attribute. Once you completed this step, you'll be able to adjust the settings of an individual product so that online store visitors can see the product but cannot purchase it.