Toggles the visibility of the layer assigned to viewport borders (AM_VIEWS, by default).
Viewports are drawn on layer AM_VIEWS. The plot property of this layer is off by default. To plot the viewports choose AMLAYER. In the Layer Control dialog box, under Layer Control tab, select the plot symbol of the layer AM_VIEWS.
The default layer for viewports is AM_VIEWS. To find out what layers are reserved for viewports in the current drawing, inspect the Object Property Settings dialog box.