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Q2A version: 1.8.5

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You may log in as admin, then move to Layout tab (admin/layout). From there, you can see "Categories" as one of the available widgets. You simply add a new widget, and display it with the option to shown on "All pages".
Then edit that widget (qa-include/plugins/qa-widget-category-list.php) , or create a similar one

    public function output_widget($region, $place, $themeobject, $template, $request, $qa_content)

if ( ! qa_is_mobile_probably() )

{put original codes here;}

This is core hack. But, whether it can be done by editing theme.php file of Snow theme .