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The fullscreen mode is not simply with the toolbar hidden. A hidden toolbar still leaves a banner on the top that shows status info like the time, battery, etc.
The fullscreen mode I see has an [X] in the upper left for leaving fullscreen, the status info bar background is now transparent (status info is still there but since it's white text, they are basically hidden when the book page is white but can be viewed when opening calibre's toolbar).
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