this is a feature request that I have seen quite a few new users do when learning and using vectorworks, so this would help them but would also speed up initial 3D views for all users, in 3D camera views, perspective views and all isometric views have an option to automatically hide the dimensions layer in 3D Viewports, so that the dimensions class only displays in top / plan, top, front, right, bottom, back and left views in any viewport.
even though it is only a few clicks to turn off the dimensions this one tick box in preferences would save hundreds of clicks throughout a year of using vectorworks.