problems with blog-layout

oh, i change from categorie-blog to featured article and it works!!!
Many thanks to you an a fine sunday!!

to Menu item type "categorie blog" says description:
shows articles from one categorie in colums.
indeed are no colums possible,but the layout is like this:
demo.hotjoomlatemplates.com/index.php?template=corporate .

i would like this layout
demo.hotjoomlatemplates.com/index.php?template=corporate
with three colums and first displaying article-description.
What can I do?

I tried "main articles" but this can`t show the article-description.

Can you send me actual link to your site , I would better understand if I see it live

Set leading to 0 in menu item settings

But i want the first item with full width

You changed something in page layout?