What font sizes are used by default in the Settings app for the titles and subtitles? The option in the red rectangle is an example.

CodePudding user response：

If there even is a recommendation, I suppose it would be to use the default sizes used by the Jetpack Preferences library. These use

?android:attr/textAppearanceListItem

and

?android:attr/textAppearanceListItemSecondary

so it is pulling the text styles from the theme. In the latest Material Components theme, if you follow the chain of references all the way up to what font sizes they are using by default, they are 16sp for the title and 14sp for the summary.