Large Print Books need Large Print Menus

Been trying to explain my problem to Amazon Customer Service, so that hopefully someone there can pass this issue up to the programmers, and they can fix this problem, allowing me to buy a Kindle for my Grandma. Here's my latest attempt:



I'm well aware of the Font Aa button. My complaint is that it doesn't work on the "home screen" where one selects which book to read. My grandma can read the book fine, but she can't select which one to read.

On the home screen, after selecting Font Aa, The options to change the size are grayed out/disabled. This is the issue I'm talking about.

Home -> Font Aa -> No options.

Large Print books need Large Print menus.