I found the solution to this.
in file: assets/js/drop_menu_selection.js
Lines 1365 & 1366
Change the Mobile and tablet breakpoint widths ( ihave changed to 1280 below for both ) and set the main menu to disappear in the CSS at the same resolution
“options”: {
“preset”: “fixed”,
“enableTablet”: “true”,
“enableMobile”: “true”,
“mobileMaxWidth”: 1208,
“tabletMaxWidth”: 1280,
“tabletCloseBtnLabel”: “Close”,
“tabletCloseBtnEnable”: “true”,
“mobileLabel”: “\u00a0”
