It is not clear which options extendToSubpages in page properties aplies to
extendToSubpages applies to property hidden (among others).
It does not apply to nav_hide .
The way the options are grouped currently is misleading. It does not make it clear, what extendToSubpages apply to. One could assume it applys to all the options in the section (which would not include hidden) or all option in the row (which might include start and stop, depending on how the page is resized) or in the "Access" tab.
I would suggest to apply extendToSubpages to all options in the "Access" tab (including nav_hide) and remove the separator.
Alternatively, move nav_hide to the "Behaviour" tab.
Or at least group the options differently.
(Personally, I would remove this option entirely and make it easier to apply page properties to subpages as well.)
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