Currently, thumbnails are not available on mobile, however the Preference "Show thumbnails in Special:Search" is displayed in Preferences on mobile.
Steps to reproduce:
1. On mobile type Special:Search in the search field or click on **Settings** - enable **Advanced mode** - click on **Open preferences**
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2. The option "Show thumbnails in Special:Search" is present and clickable. Clicking on it won't have any effect on mobile Search experience - CORRECT behavior.
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**Notes:**
(1) Having an option that doesn't do anything might be confusing for users. Changing the option's status will affect desktop experience which can add to the users confusion.
(2) This case (the option that doesn't do anything on mobile) is not unique to "Show thumbnails in Special:Search". Another example is Watchlist -"Use non-JavaScript interface".