Iframes with XStore theme works in the same way as with a default theme.
Add “Raw HTML” element http://prntscr.com/o8k7bu on the page with such content – <iframe src="http://tor.............................er.com/" style="height:100vh; width:100vw" frameBorder="0" seamless="seamless"></iframe>
you will get – https://prnt.sc/o8k6oa
