Hello,

Please try adding the following Custom CSS in the Custom CSS for Mobile area under Theme Settings >> Custom CSS.

.wd-sidebar-opener.wd-on-shop.wd-tools-element.wd-on-toolbar.sticky-toolbar.woodmart-sticky-sidebar-opener.shop-sidebar-opener a::before {
    font-size: 16px;
    content: "\f118";
    font-family: "woodmart-font";
}

Best Regards