How can i add settings to my book on ibook author?

i'm making a project, and i almos finished, but when i made a preview, i can't change the text size; i want to add that setting to my book, i mean that option on the right top corner where you can change the text size and background color. Thanks for your help

Not available in iBooks Author.   Available options are brightness slider, book search and bookmark.
Set your font size higher than default if you have concerns.
I have to say, I have not checked the portrait templates yet...which are more likely to be used for flowing text only books, but knowing Apple, I doubt they will have the option either.

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