I have no idea whether this was helpful, but https://www.gnutellaforums.com/tips-...mail-text.html is a similar question you asked a few months ago.

Alternatively, depending on which browser and which email service you are using, there might be an option to show the full page or to to be able to shift to the right-side of the email. I recall needing to do this some weeks ago. It might be as simple as a horizontal scroll-bar or a show all or full-page button or option (possibly from a drop-down menu option.) If you get advertisements on the right-side of page, there might be an option to hide or shift those further to the right so you can see more of the message.