You have drawn your paper? Since you continue with "inserted viewport" I hope that you have drawn the paper in the Layout (i.e. in Paper Space)?
Go into Page Setup Manager (right-click on the Layout tab at the bottom left corner and find Page Setup Manager) and set up what paper you would like. In my line of field, A1 is the way to go but it depends on what you are drawing.
After you have done that, you don't have to draw your paper. You will see a black square on your screen that is your paper.