In the channel guide you will see two segments: "Now" and "Next".
The "Now" column shows the content that is currently playing, selecting and clicking on these contents will change the channel shown in the mini player.
The "Next" column shows the information of the next content.
When we have that same content in the "On Demand" section, you can click on it to see more information and decide to watch it immediately, without having to wait for the content to be broadcast live on that channel.