James asked if there was a way to increase the font size used in the column drop-down lists that appear when you enable the AutoFilter in Excel. He normally sets the zoom on his worksheet to 60% so that he can see more of the worksheet at once, and the drop-down list font is smaller still.
Unfortunately, there is no way to change the size of the font. The font size used for some Excel controls is modified whenever you change the display properties in Windows, but none of those affect the drop-down font, either.
Because the font size increases in proportion to the zoom factor used for a worksheet, there is one potential workaround. You could increase the zoom factor a significant amount, say to 100% or even 125%. Then, select the data in the worksheet and decrease the font size and adjust column widths so you can see as much of the worksheet as you could at the 60% zoom factor. The change in worksheet font size should not affect the drop-down font size. That should still be tied to the zoom factor, and now be large enough to easily read.