ubermenu width question

How do you change the width of ubermenu? I have tried multiple options but seem to be going around in circles :/

I am trying to recreate the demo but am failing somewhere. For example, on the demo if you hover over ‘Gaming News’ on the menu with ‘Adventure’ highlighted you can see a nice picture (Ori) with 2 columns of posts to the right – my website has the same picture but with the posts underneath.

Also on the demo if you hover over ‘Gaming News’ again and highlight ‘Racing’ you see 4 columns of pictures – my website has the same pictures but in 2 rows and 2 columns.

You’d think it would be such a simple thing to change the width but I’m damned if I can find it! Any help would be appreciated 🙂