Thoughts
I’ve seem content width discussed often when it comes to reading. A width of 72 characters comes to mind, though I’m not sure where I picked that up. I haven’t seen content width discussed as often when it comes to writing. That said, there are tools provided within, or as addons for, text editors (like zen for Doom Emacs (a)) which constrict the writing space.
Notes
Set your editor’s column width very low … 36 characters for me, [your mileage may vary].
Thinner columns help you read faster. Writing speed is dominated by reading speed. If you read faster, you write faster.
Bibliography
Yunits, Breck. n.d. “Write Thin to Write Fast.” Accessed February 7, 2022. https://breckyunits.com/write-thin-to-write-fast.html.