Change the space used for my x-axis labels
 

Can anybody help me?
I have an column chart with words as labels. My problem is that I can't
change the space used for the labels, that is some labels is in two or three
lines and I would like to use more room for the labels and less room for the
chart itself. But when I make the chart smaller then the labels just are
dragged upwards - how do I prevent that??