On Builder -> Website Settings -> Third-Party

<script>setTimeout(function () {var qs,js,q,s,d=document, gi=d.getElementById, ce=d.createElement, gt=d.getElementsByTagName, id="typef_orm_share", b="https://embed.typeform.com/"; if(!gi.call(d,id)){ js=ce.call(d,"script"); js.id=id; js.src=b+"embed.js"; q=gt.call(d,"script")[0]; q.parentNode.insertBefore(js,q) }}, 1500)</script>

On Builder -> Developers

On file css/custom_changes.css

Add code:
.typeform-mobile-modal-open {
    overflow: hidden!important;
    position: fixed!important;
    top: 0!important;
    left: 0!important;
    right: 0!important;
    bottom: 0!important;
    margin-bottom: 0!important;
}


On file templates/web1/layouts/main.html
For example to add a link on the menu
<li><a class="typeform-share link" href="https://_typeform_user_.typeform.com/to/_typeform_id_" data-mode="popup" target="_blank">About Us</a></li>


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