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When you work in paper space on a Layout tab, you can still view your drawing in model space. First you need to create a layout viewport in paper space; this allows you to view your model space entities from paper space.
Within a layout viewport you can modify and snap to model space entities while working in model space and even snap to model space entities from paper space. Snapping to model space entities from paper space allows you to accurately dimen-sion model space entities in paper space. And although it is generally more conve-nient to modify entities on the Model tab, there are often times when it is convenient to make modifications from a layout viewport on a Layout tab.
Zooming or panning the drawing in model space or paper space affects the entire drawing, unless you use multiple windows or viewports. Additionally, if you are working from paper space, you can lock the layout viewport so the viewport scale and view center do not change while panning and zooming in the layout viewport.