Use the Google Chrome incognito window to see your site as the public do.
The Chrome incognito window is a useful tool for Google Sites webmasters. Whenever you view your new website, if you are logged in to Google Apps you'll always have an Editor bar at the top of your site. But sometimes you just want to see the site as a visitor would see it, without having to switch to another browser or logout of Google Apps - and you can by opening an incognito window.
It's also really useful if you want to quickly login to another Google Apps account.
To open an incognito window, click on the three horizontal lines icon in the top right of your Chrome browser and select New incognito window.