Best Answer Danny , 07 February 2013 - 09:00 AM
Firstly, I am not 100% sure that this is indeed a bug, I was comparing the responsive design to that of Bootstrap which is what the Fixed Navigation is based on. However, this could be a design choice by our developers. I have created a bug report so we can get confirmation on this and as soon as we do, either myself or one of our other support team members will reply and inform you.
If you wish to hide the search on mobile devices you would want to use the Browser Specific CSS plugin and use the .mobile class in your CSS. I have provide you with a link to our browser specific css documentation.
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