Do you find folders unnecessary on this page / do they mess up your mobile phone access to this page?
/*hide folders in course creation -> training materials tab*/
div.player-arena-overall-container div.row-fluid div.span4 {
visibility: hidden !important;
width: 1px !important;
}
div#player-lo-manage-panel.player-arena-board div.row-fluid.player-lo-manage-header div.span4 {
visibility: hidden !important;
}