How to set number of columns in SceneByFrameRepeater?

Hi,

Thanks for the good work in Scenes and it has enabled me to define custom apps easily. I am doubt and I believe you will be able to support. I want to use SceneByFrameRepeater and I followed the example in Demo.

I am not able to set the number of column in SceneByFrameRepeater and not sure how to handle it. Do you know?