Layouts Overview
You can create multiple layouts in CAD or SolidWorks eDrawings drawing documents using the Create Layout 
tool. With layouts, you can look at related views together, regardless of their original locations on drawing sheets.
The Overview Window 
displays the entire drawing sheet in a pop-up window and is used to:
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Create layouts.
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Add views to layouts.
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Display a drawing view from the Overview Window when you are animating a file. Click Overview Window
or View, Overview Window, stop the animation, then double-click a drawing view in the Overview Window to display the view in the animation.
Drawing sheets show you the drawing and associated views. You cannot delete or change the drawing sheet. Layout sheets have the same properties as drawings sheets, plus they allow you to drag, move, or delete views.