How to add multiple rows to home screen

I have been using the videoPlayer example to understand how to create channels. I have had some succes but I have been unable to figure out how to display categories in rows on the home screen.

The original home screen on the videoPlayer example has one row I would like to add multiple rows (similar to netflix or hulu).

I know that I have to change how the screen is drawn but I cant find what needs to be changed.

Thank you for reading this. I appreciate any information you may be able to give me.