Changing to Full Width

[Moin]

Usually the width of the text area isn’t increased because long lines are harder to read

@awesomerobot

There’s often not much benefit to more horizontal content on the screen, at one point it starts to make reading less efficient… Readability: The Optimal Line Length – Articles – Baymard Institute

You can change the width of the topic-body with some custom CSS: How to increase width of topic - #7 by awesomerobot

And I think this theme component supports that too: Discourse Custom Width