With AMP plugin 1.5.0, we got "Preview AMP" button now on the header toolbar on Atomic sites (which run the latest version of the plugin). We don't have that currently for simple sites, but it would pop up there too once we upgrade.

It shows up for post editor, not for the page editor.

Clicking it opens a preview to show how the post would look like on AMP.

It's a bit advanced feature for most .com customers and has too high prominence in the header toolbar. We'll need to find a better place for it.

@olaolusoga suggested moving to "Document" sidebar somehow. For now, we can just hide this and look at the placement together with other social media/SEO preview questions ahead (p58i-93P-p2).

Another place could be in the new preview dropdown: