The only options you get are the ones your device is wide enough to preview. If the result is no devices, then the tab disappears.
The Responsive Preview module provides content and theme administrators with a quick way to preview how their site's pages will appear at ...
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responsive_preview 7.x-1.0-rc1 ... This release candidate contains all the improvements from the latest patch in #1741498: Add a responsive preview bar to Drupal ...
The responsive preview module proposed here is a light-weight tool for content creators to quickly determine how their pages will appear on smaller devices. It ...
Follow up from #1741498-40: Add a responsive preview bar to Drupal core. Currently, iPhone5, iPhone4, iPad, Nexus 4, Nexus 7, and Typical ...
Add an orientation toggle to the responsive preview feature so that a page may be previewed in portrait and landscape modes · Problem/Motivation.
Module of the Week: Responsive Theme Preview https://www.drupal.org/project ...
From the node list I navigate to an edit page: /node/edit?destination=admin/content · I click the preview functionality in the toolbar · I see ...
See screenshots in #1741498-41: Add a responsive preview bar to Drupal core. Note that both phones and tablets typically have device or browser chrome ...
Configure the menu block to show unlimited depth and exposed at all times. Create a couple of basic pages (nodes) and give them menu links. Add ...