Use below CSS to make Oxygen Builder off-canvas menu clickable

#-pro-menu-7-16 .oxy-pro-menu-off-canvas-container .oxy-pro-menu-list .menu-item-has-children .oxy-pro-menu-dropdown-icon-click-area {
    position: absolute;
    right: 0;
    margin-right: 0;
    background: #000;
}
#-pro-menu-7-16 .oxy-pro-menu-show-dropdown .oxy-pro-menu-list .menu-item-has-children > a svg {
    margin-left: 0px;
}

Bottom menu border at 992px and below

@media only screen and (max-width : 992px){
.oxy-pro-menu-list li		{
    border-bottom: 1px solid #ddd;
}
}