If these are data validation dropdown lists, you can't change the font
size. There are a couple of workarounds he

http://www.contextures.com/xlDataVal08.html#Larger


Stan wrote:
How can I enlarge the font in a EXCEL "drop-down" list?


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Debra Dalgleish
Excel FAQ, Tips & Book List
http://www.contextures.com/tiptech.html