I hope I will succeed in translation - as my OS UI is in Hebrew.
* Right click on an empty place in your DeskTop > 'Properties...'
* Click the View [or is it display] Tab > 'Advanced'
* Open the "Item" Combo-box and scroll down and click the "Tool Description'
choose the font SIZE > OK > OK.
*** I don't think that changing the font type and/or color will affect the
Comments in Excel.
*** Pay attention that this procedure will change all
*** There is no problem to write a short Macro that will format all the
comments in the active Workbook.
Micky