Menu does not match the size of what is previewed in editor

Question:
At the tablet breakboint, my main menu becomes giant - despite looking normal in the editor.

Product:
Wix Studio Editor.

What are you trying to achieve:
I am attempting to reduce the size of the primary menu on tablet, currently it completely fills the width

What have you already tried:
I have tried editing the responsive behavior to fixed, adding more pading, and made the menu less large.

Please see image for size comparison between editor and preview