Hello and thank you for the post, sorry for the late reply.
I have been looking at the preferences within PicoScope and we do not have the option to increase the "Notes" font size.
I have looked at the Windows display settings for text within message boxes, but no alterations here reflect in the font size of "Notes" contained inside the message box (notes section of PicoScope)
I will add this as a new feature request with the software team as there may be an option deeper inside PicoScope that will enable an increase.
As soon as I have some news I will feedback here.