Option to force two-column layout

**Is your feature request related to a problem? Please describe.**
I use lazygit in the VSCode integrated terminal. Depending on the terminal width, the lazygit GUI has either one or two column.

**Describe the solution you'd like**
I'd like to always stick to two columns.

**Describe alternatives you've considered**
I've seen https://github.com/jesseduffield/lazygit/blob/master/docs/Config.md , but didn't see an option to force a two-column layout. But maybe I missed something?!