How to code default collapsed submenu strip?

Been mish-mashing together some code from the ‘Wix Mega Menu’ example and the problem I have is that the ‘submenu’ is by default showing and not collapsed but the ‘sub-sub-menu’(which is megaMenuStrip) is collapsed by default. I don’t really know how to code so any help is appreciated to figure out how to make this submenu collapsed by default. The strip I’d like to be default collapsed is called “subMenuStrip”. Below is a portion of the code I think is useful but can include more if need me.


function selectMenu(menu, clickedElementId) {
    let nestedMenus;
    if (menu === 'mainMenu') {
        nestedMenus = ['subMenu'];
        $w('#megaMenuStrip').collapse();
    } else if (menu === 'subMenu') {
        nestedMenus = ['productMenu'];
        $w('#megaMenuStrip').expand();
    }
    nestedMenus.forEach(nestedMenu => {
        $w('#' + nestedMenu + 'Repeater').data = filterRepeaterData(menu, nestedMenu, clickedElementId);
    });
}