Menu problems in mobile

Hi there. I have a few question about mobile version of my site. First, why does the menu bar crop at the right side of the screen? I think it would be better to fill the whole screen while in menu. Second, I don’t see the most significant section of my site in the side menu bar. I mean “3D Printers”. If you open the desktop version of my site you’ll be able to see this section on the main page.

I don’t understand why it works in this way in Safari and how can fix it. Please let me know


Contact with your purchase item author hope they will helped!