Obsidian should have an adjustable line length. On different displays the “readable line length” is not working (and sometimes should be longer/shorter in my opinion). It would help a lot to improve overview in longer texts.
The app MarkText (Open Source, also Electron) has a great solution: a custom field for max width and custom unit suffix like ch (characters), px (pixels) or %.
I somehow fiddle around with a custom css, but since it’s moving the scroll bar it annoys me.
I’d be happy to see something similar in the future in obsidian.