There are several benefits to switching between model space and paper space to perform certain tasks. Use model space for creating and editing your model. Use paper space for composing your drawing sheet and defining views.
The Model tab accesses a limitless drawing area called model space. In model space, you draw, view, and edit your model.
Layout tabs access an area called paper space. In paper space, you place your title block, create layout viewports to display views, dimension your drawing, and add notes.
You can access model space from a layout viewport to edit objects, to freeze and thaw layers, and to adjust the view.