Unfortunately, the new guy (me) gave you slightly inaccurate information. Sorry about that. Here's an update from our product team:
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Our only responsive templates are those for emails
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Responsive designs for our landing pages is possible, but can not be done with the Landing Page editor.
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You can always cut an d paste your own responsive code into a template
If there's some additional functionality you would like, please suggest it to our team in our Ideas section of the Community.
Hope this helps!
Scott