After you create layout viewports, you can modify them as needed. On the Layout tab, you can snap to the viewport borders using entity snap. You can also copy, delete, move, scale, and stretch layout viewports as you would any other drawing entity.
Modifying a layout viewport on a Layout tab does not affect the model space entities within the layout viewport.
NOTE You can only select layout viewports for modification. If you click a viewport on the Model tab, it makes that viewport active, not available for modification.
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Understanding paper space and model space
Viewing and scaling layout viewports
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