I am using Bootstrap v3.
I have the navbar classes in place so that when I have my screen mobile-size the navigation collapses and the little grid-like toggle button
Easiest way i found is to change the variable.less file and change
// Navbar collapse
//** Point at which the navbar becomes uncollapsed.
@grid-float-breakpoint: @screen-sm-min;
to
// Navbar collapse
//** Point at which the navbar becomes uncollapsed.
@grid-float-breakpoint: ( your break point );
Only if you use LESS ofc.