Increase size of BASIC Dimension box

I am running S/W 2010 SP4.0...

We use basic dimensions on a lot of our product drawings.

I have notice that the box surrounding the dimension is not big enough to show the upper dim when using an inch/mm display setting...

Attached is an example...

How can I increase the space around the basic box...

Thanks.

SolidworksDrawings And Detailing