File [ page ] below screen .

[KENBOYDART]

Hi, my probem is very small but it bothers me, when I open a file on my Macbook Pro very often the bottom of the file is BELOW the bottom of the screen ! I am not able to grab the b. right to lift as it is not seen. I can move items inside the page but I can't LIFT the file....strange thing I know but it bothers me, thank you for your help ! Ken