To preview your site on a mobile device, follow these instructions:

<ol>
	<li>Click on My Account at the top of this page.</li>
	<li>Select Website Builder from the drop-down menu.</li>
	<li>Enter your username and password and click Log In.</li>
	<li>Click the Preview eye icon on the top menu.</li>
	<li>In the Preview screen, select a mobile device (you can preview your site in a landscape or portrait view).</li>
</ol>

<div class="articleYellowBox">
You can also scan the QR code presented on the right side of the preview window with your mobile device to automatically access your mobile site.
</div>

How To Preview Your Site in Mobile with Website Builder

https://customerservice.web.com/prweb/PRAuth/app/WebKM_/datacontent/Image/rteImages