Best Answer zonic, 03 January 2015 - 11:10
Najnowszy bootstrap sam podpowiada jak to można zrobić:
Changing the collapsed mobile navbar breakpoint The navbar collapses into its vertical mobile view when the viewport is narrower than @grid-float-breakpoint, and expands into its horizontal non-mobile view when the viewport is at least @grid-float-breakpoint in width. Adjust this variable in the Less source to control when the navbar collapses/expands. The default value is 768px (the smallest "small" or "tablet" screen).
http://getbootstrap....ponents/#navbar
Czyli wystarczy zmienić waertość @grid-float-breakpoint z wartości @screen-sm-min na wartość @screen-md-min i przekompilować LESS
