Customizer settings are theme-dependent.
Some themes only provide a few options, while others provide a dazzling mess maze of options. And most themes provide only minimal options in the free version, but offer more customizability with a companion paid plugin.
Then accessibility support is by and large left to the theme’s author, so as you’d expect, different themes will vary wildly when it comes to accessibility.
Specifically for the GeneratePress theme, only the paid PREMIUM (ie paid) version supports editing the copyright message in Customizer. But, to their credit, the theme provides a whole lot of filters to easily and completely customize the theme (including changing the copyright text) via code.
In any case, I’ll recommend you ask questions relating to the GeneratePress theme in the theme’s own support forum, so its author and user community can help you: https://wordpress.org/support/theme/generatepress/
Good luck!
Sorry for the late reply, apparently this account is still linked to an email address that I don’t check regularly anymore. I’ve been through the customizer with several themes, and I don’t see any options with screen readers anywhere.
NonVisual Desktop Access (NVDA) is a free and open source screen reader … For example, if you want to customize commands related to browse … Plugins allow you to customize the way NVDA behaves overall lovelanguagetest.org or within a particular application. They are able to: Respond to particular events … Testing using NVDA latest version, Firefox and Internet Explorer latest builds and windows 7. Just did some tests on the menus. NVDA is a free, open source screen reader available for Windows. … on secure Windows screens, like logon, and has a rich set of customizable preferences.With NVDA running, press Insert, N to open the NVDA menu. Choose Preferences, Voice Settings. To do this with the keyboard, press the Down Arrow once to select …
I think I’m going to mark this as resolved, as in playing around with my site, I found more customizer options I didn’t see before.