Hi Mason, are you by any chance using the Wire tool? This is a fixed size pen regardless of zoom and will appear one size on export. The Fixed Width Pen works better for sketching with a consistent line width and will export as you see it on the canvas. If you’re comfortable with selection, go ahead and select your markups and change them all to the new pen, and adjust the brush size to what you like. That way you don’t need to redo your work.