Overlay planes can only be created in the perspective window. Unlike canvas planes, they do not exist in the 3D environment. Overlays only exist from the particular view from which they are created. Overlay planes allow you to annotate or create drawings directly over your geometry. Use Windows
EditorsConstruction Plane Editor to quickly access the overlay planes that you have created.
Using the Paint window, you can view all the canvases and overlays in the scene. Working with overlays in the paint window allows variable zoom without losing registration of the underlying geometry.