Immersive Reader - Improve Reading Accessibility

How to save customized settings.

I installed the app yesterday and think it's fabulous. However, I need some help. Each time I run the Immersive Reader plugin, it loads with default settings even though I customized the settings (reader gender, reading speed, screen color, number of highlight rows, etc.) the previous time I ran the app. I've looked all over the app's settings pages and cannot find a way to save updated defaults. In short, where is the save-settings button? Thank you for your time. --Kirk