Lollipop 5 overview / recent apps in landscape listed top to bottom? Put apps list down low to keyboard height like KitKat 4 cover flow recent apps
That's correct. That's the only available layout in stock Lollipop. Any alternative Recents layouts would require rooting and/or custom ROMs. The alternative layout you're seeing is HTC's custom layout. OEMs are free to alter it in any way they choose, and many do.