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 [https://bugzilla.mozilla.org/show_bug.cgi?id=1600510 this feature request] from 5 years ago with no responses. How can I enable line wrap for reading messages?