Dear pl,
first of all, thank you for the purchase!
The Expanding Slider has been hidden from mobile versions on purpose – during the testing it turned out that it’s quite difficult to interact with on smaller screens. In case you want to disable to mobile versions of Sensei, i.e. make the theme act on tablets and smartphones in the same way as it does on large screens, please download this file from my repository, unzip it, and upload the contained css file via FTP into the theme’s folder (wp-content/themes/Sensei), replacing the existing file.
Hope this helps!
Sincerely,
Andrew | Satori