Ok i figured it out. its the Printing accross button. but where do i find the line on the right? it looks like the margin?
While in layout mode, select Layout setup..|Printing and you'll see that the above layout specifies 3 column printing. The vertical dashed lines are the column borders and the heavier dashed line that extends into the header on the far right is the current page margin--you can change the location of this line by selecting different options such as page size and orientation in printer set up.