Help With Screen Options Tab Not Working

I wonder if you can help me please. My screen options tab at the top of my WP dashboard doesn't seem to be working in Google Chrome, I have inspected the element and it seems there are some javascript running errors but I don't know how to fix them and am only a beginner at coding. Could you help please? I can grant support access if needed.

This is for our http://www.legends.report domain name

Many thanks

Adam