go to your layer manager, mine is top left hand corner, scroll down to viewports(or whatever you have called it) and the the little lightbulb beside it, click on it and it should go away
provided you have set your layers up right
In the layer manager, you can select which layers plot or not. By default, we have every layer turned on to plot bar one, usually called the defpoints layer, all your viewports should be drawn using this layer. Alternatively, select the layer that you have used to draw your viewport in layer manager and turn it off to plot. Pic below shows the column under which youn can turn the appropiate layer on or off to plot