Vertical menu cut off on Mac screen

Hey. I am creating a logged in site for members. I have set it all up on my iMac. However, when I visit the site on my macbook, I cannot see the vertical menu. Only a little bit of it. It’s like it is cut off. Anyone who knows how to fix this problem? It works fine on iMac, and on mobile. But on a “normal” sized screen, which most of the customers have, it does not work..

Thanks in advance!

Christian

The page I need help with: [log in to see the link]