The menu options I am presenting have gotten too long for the screen. I would like to reduce the font size in order to fit more items on the screen. I know I can break this into into sub-menus if there is no other alternative.
I have researched and found no options on the createmenu statement that can control this. Is this possible to do?
What you are asking to do cannot be done, because Google Docs Editors such as Google Sheets, Google Slides and Google Docs do not support customization of built-in user interface elements.
To make a large number of menu items more manageable, use Menu.addSubMenu() to create a hierarchy of menu items.