Applies to 2018.1 Update and later
Layout viewports are objects that display views of model space. You create, scale, and place them in paper space on a layout. Once you create the viewports, you can change their size, their properties, and also scale and move them as needed.
On each layout, you can create one or more layout viewports. Each layout viewport is like a closed circuit TV monitor of a view of the model at a scale and orientation that you specify.
When you use the MVIEW command to create a new layout viewport, you specify the view that you want to display in it with one of several methods:
After you create a layout viewport, you can change its size, properties, and also scale and move it as needed.
To prevent accidental panning and zooming, each layout viewport has a Display Locked property that can be turned on or off. You can access this property from the Properties palette, the right-click menu when a layout viewport is selected, a button on the Layout Viewports tab on the ribbon, and a button on the status bar when one or more layout viewports are selected.