It would be very nice if the user could set the font himself, the standard sans-serif font doesn't suit me very well for reading long texts, for example.

In order to be able to read with focus, a full-screen view would also be more comfortable, i.e. hiding the title and status bar.

Maybe it is possible to access the Reader View of Safari?
This has already optimized many typographic settings by default.

Wallabag:

Reader View Safari (iOS):