Preview a screen layout to see whether the different screen layout components and their appearance and placement meet your requirements.
note: The contents of the project do not appear in a screen layout preview. If you want to see how the content appears in a certain screen layout, map the screen layout to a screen profile in Multiscreen HTML5 or Responsive HTML5 layout settings and click Preview in the toolbar.
To preview a screen layout while editing the screen layout, do the following:
1)Press Ctrl + W.