Issue with scrolling the menu sidebar?

I'm using the free version of Chique and am thinking of purchasing the Pro version but before I do I had one question about the only thing that currently concerns me with the theme. On the left sidebar where the menu options are, is there a way to add a scroll feature? I've tested the site on several computers and depending on what screen resolution is set to, up to half of the menu options are not visible on the screen and you are unable to scroll down in the left sidebar to view the rest of the menu options. Is there something I'm missing in the settings? Or is this a feature only available in the Pro version? Or is something not working properly. Many thanks for your reply!