The mobile theme for smartphones is now set to autodetect mobile devices. If you prefer to use one of the other styles, then use the link at the bottom of the page to reset the style back to your prefered theme. The site should remember your choice so you should only have to do this once.
In addition, please note that both forums and threads with new posts are highlighted in red. To go directly to the new post in a thread, tap the "New Post" icon. Also note that the red and gray stars next to some of the topic listings are used to distinguish sticky threads from normal threads.