How do I change the width of messages?
Currently Yahoo sets the width of messages displayed in the Yahoo interface to break at roughly 86 characters, in order to be compatible with most computer monitors. Note that if you reduce the width for viewing messages, text may appear uneven, since we do not remove any line breaks. If text appears uneven on a regular basis, you may want to consider viewing your messages in a smaller font size in your web browser as an alternative to reducing the message width(s). To change the font size in your browser, please refer to your browser's help files or help menu.
If your message composition area or the messages you read are not wide enough to fit your window, you should increase your browser's window size, or screen resolution. This will not necessarily increase the width of messages you read, since we do not remove any line breaks that may have been inserted by the sender.