set default width of PDF viewer window?

I’m using the latest DT pro version on mac 10.8.4

Whenever I double click a PDF file to view it in DT’s PDF viewer window, it is always too narrow and I need to manually drag the window edges wider, click zoom in, etc.

The ‘View–>Zoom to width’ and ‘View–>zoom to fit’ commands don’t help me widen the actual window, and the window width does not seem to be remembered
in the same way that Finder windows can have an opening width remembered.

Does anyone know how to automatically make the PDF viewer window wider, or to set a default width?