Excel Chart increase size of Horizontal area

Sorry for the cryptic text, but I would the like to increase the size of the Horizontal area but I am unable to do so

I have increased the size of the font to 20 and as you can see it will not fit.

What is going on?? How can I make that area bigger, or does it only "grow" if I increase the chart size.?

Ideally I would like to have the text for every column in an angle under the bar (if that is possible)

Edit: I tried to post in the "Chart" area, but It said I am not allowed to post a new thread there.