Changing 3 columns to 2 columns

Hi all
My current theme has 3 columns on the Main Page:
https://pasteboard.co/J0ykCJd.png

What I am trying to do is to convert it into 2 columns, so there is more room for text to be displayed. SO Basically:
Menu Bar on left > 2 columns of blog entries > Sidebar on the right.

I tried looking thru the CSS that starts around “my journey” and found this CSS code:
section-content-wrapper layout-three

But even after finding it in the stylesheet.css of my theme, I am not able to figure out how to achieve it. Searching online also did not help.

Thanks if anyone can help fix this!!

The page I need help with: [log in to see the link]