I've needed to fix a part of the problem by creating a fix in javascript to bypass your meta :
javascript
:var metas = document.getElementsByTagName('meta');for (i=0; i<metas.length; i++) {if (metas[i].name == "viewport") {metas[i].setAttribute("content","");}}
This is the screenshots before and after the fix :
Attachment 7421
Attachment 7422
As you can see, even in vertical view, I'm now able to display 4 cards per row instead of only 1 !
But the password text box stay hidden, even with this fix. Hope it can help to resolve the problem.
Have a nice evening.