I use 12 columns so I can still do this 1/3 - 2/3 split, but other proportions as well. I tend to have a chat app on the left quarter, browser in the middle hal

I use 12 columns so I can still do this 1/3 - 2/3 split, but other proportions as well. I tend to have a chat app on the left quarter, browser in the middle half, and a music app on the right quarter. Lots more freedom than only two zones!