Responsive menu for all sizes

Hello WordPress comunity

I have problem with menu , in some desktop display sizes it loses size

The problem —>http://prntscr.com/ard4f8

How do i want the menu to stay—>http://prntscr.com/ard55b

My site—> http://www.healthylifes.net

This is my first topic here i hope you guys know better how to fix this.

Thank you so much