toonetcreation
Hi
You can change the menu breakpoint from the /less/Variable.less file .
Find
// Point at which the navbar stops collapsing
@grid-float-breakpoint: @screen-md-min;
Replace it with
// Point at which the navbar stops collapsing
@grid-float-breakpoint: 1024px;
Then compile Less to Css .
kindly take backup of site before compile less to css .
LESS to CSS will override your style changes in css files .