Not enough room on Values and X axis labels
 

I have a stacked bar chart that I created by the chart wizard but now when I
try to change the source data it cuts off part of the values and x axis
labels so I cannot change these and I cannot add anything to the values or x
axis labels. I need to get rid of one of the columns in the chart. Do I have
to redo the chart via the wizard again or is there a setting or a way to
change the values and labels?
Thanks,
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D