When in Ubiquity at the page level, you will be taken to a Preview tab.
The page Preview tab allows you to view a preview of your page in different screen sizes and orientations.
Click the example device buttons to change the dimensions of the preview.
You can open the page preview in a dedicated browser window and vary the dimensions yourself by clicking the popout preview button.
The view more button gives you some more information on previewing your page on an actual mobile or tablet device.
Click the link button to see the URL of the page. You can use this URL to link to the page from other apps, etc.