How this section can be turned on and off:

1. By moving the entire “Index” labeled “Projects” to the “Not Linked” section in Squarespace control panel, left side bottom. 

2. “Not Linked” pages are public, but do not appear in navigation.

3. To make the page not public, under the preference per Project Index make sure “Enabled” has is not checked. Disabling a page is useful while it is being worked on. Disabled pages are accessible only to administrators.