Change maximum zoom size of reading pane box (entire contents: text and graphics) in office for mac 2011

Now I have a good monitor everything displays smaller in outlook (I do not want to have to reduce  the resolution) and when I have outlook open reading an email in the preview pane I can adjust the size of the text only which makes the email look disproportionate i.e. big text little graphics. When I look at my screen the important content part is too small i.e. a small veiwing box in a lot of grey space. Is it possible to zoom the entire box so it fills up  the preveiw pane? less grey?

What I have tried.

Increasing the text size to see if the box gets bigger. It does get a little bigger but I am left with ugly big text and a disproportionately small graphics.

Reducing the size of the other columns: The maximum size of the actual material box in the reading preview pane stays the same size?

Any suggestions?

Thanks in advance

Using a 2004 mac mini running Yosemite and office 2011 for mac from 365 download