You decide who is allowed to see your InSite! You can determine individually the visibility of your whole InSite as well as of each element you upload. Via the eye-symbol you can easily choose between:
As admin of the InSite you can review the visibility setting via the Dropdown "View" at the right top corner of the page at any time. Just choose between the different options and you can already see how your InSite looks from the point of view of someone else.