I am sure that I have overlooked some feature of Zimbra and I am looking forward to being corrected, but my problem appears to be this...

Using Zimbra 3.0.0_M3_381 I would like to be able to view a mail in a conversation in the entire right hand pane of the screen. i.e. without the lines for each other portion of the conversatiion appearing above. The simply use Next/Previous buttons to navigate through the thread. As it is when a conversation becomes lengthy the size of the viewing area becomes quite small.

This is so obvious that I am sure that there must be a way of doing this and that I am justnot seeing it. Can somebody point me to the solution please?