Is it possible to change the size of font on the menu items?
As far now it is not possible. We can only change the font not the size. I hope articulate would consider this addition in future (the current font size is so small for small screen devices such as tablets when published in HTML5)
Electron is correct. Currently, it's not possible to adjust the font sizes of the player elements, including the player menu. Additional customization for the player elements is definitely a popular topic. If you haven't already, I'd encourage you to send a feature request to our development team. Please be sure to provide as much information as possible.
You can submit a feature request using the form below:
Articulate > Submit a feature request
In the meantime, maybe a custom menu would work for you? Obviously, it would take more time to build something like this, but it may pay off in the end. You could have more control over the placement, design and formatting of the menu. Just a thought :)