Is not view chapter missing in mobile view?

Editing
1

I can see the view chapter buttom with a big screen

22

but in mobile is not available

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Captura de pantalla 2018-10-24 a las 10.06.48.png766×200 18 KB

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It’s the same in WordPress, without Pressbooks installed.

wordpress-1

wordpress-2

If you wan this feature you should report upstream IMHO.

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https://core.trac.wordpress.org/ticket/45177#ticket