I tried to use free-form landing page template which is validated for mobile compatibility. Then I create a landing page using that template. Activated mobile version which displays blank.
Do we have to add any extra code to display in mobile version?
You'd be further ahead avoiding the Free-Form Landing Pages all together. I think the only reason those are still an option is b/c there are some really old systems that were using them so they couldn't be retired and perhaps some folks that just haven't caught up to speed over the last 10 years.
For the free-form pages, there's basically two version of the page to create (and who wants to work twice as hard as you need to?) -- one for desktop and one for mobile. I'd recommend looking into the Guided Landing Pages, there's even some free templates in the Marketo Docs to help get you started here: https://experienceleague.adobe.com/docs/marketo/using/product-docs/demand-generation/landing-pages/landing-page-templates/guided-landing-page-template-list.html?lang=en
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