Is there a way to change the size of punctuation?
Punctuation is simply text so you are able to change the font size for individual punctuation items - by extension because it is text you cannot have the punctuation automatically change to a different size while you are typing, however you could do an edit/find all for say ? in your document then change the font size for them all.
You can change the font size to any of the offered sizes or you can type in a different size: for example the list shows sizes 32 and 36 but you can type in 34 and it will respond accordingly.
If you do this frequently or want to do all of your punctuation you could create a macro to run multiple find and change actions.
Hope this helps