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


Juana Cafe wrote:
I created a drop-down field with multiple menu choices. I am not able to
increase the font size for those menu choices. The adjacent cells have a
much larger font, and I would like my spreadsheet to be consistent.


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