Keynote Presenter Notes font size
How to enlarge or change the font in the presenter notes? simple!
1. Change the notes to your linking in one slide
2. In the Format pane on the right make sure that that paragraph style is set to "Presenter Notes"
3. Click blue "update" button right next to the presenter notes paragraph style.
4. It will change the presenter notes of the entire slideshow to that updated paragraph style.
If you have it saved in the iCloud, the changes will also be reflected on the iPad/iPhone. You have to exit the slideshow and then open it again.
MacBook Pro with Retina display, iOS 11.4, null