Lines are not wrapped when viewing plain-text messages
I must be seriously doing something wrong. When viewing plain-text messages in Thunderbird, lines are not wrapped according to the available window width, but instead each paragraph is displayed as one long line and I have to scroll horizontally to read it.
I am also really confused why I cannot find any info about this online. The only thing that I could find is this feature request from 5 years ago with no responses.
How can I enable line wrap for reading messages?