ONE COLUMN WIDGET not like demo

Hi,

Please help to guide how to make 3 One Column Feature Widget located horrizontally in a section of page as demo (PROGRAMMING (ONE COLUMN WIDGET), ANIMALS (ONE COLUMN WIDGET), WORLD NEWS (ONE COLUMN WIDGET))/

I try to add 3, but they are located vertically instead.

Also, the Feature Post Slide is not full of page as demo but it shows 2/3 and the remaining is the secondary slide bar

Thanks