The page background should be applied to the page extents, but is currently limited by the page margins.
It appears that other's have asked to have this functionality repaired in Writer, but I'm not seeing anything for draw:
This request is related as the background should extend to the bleed marks as well:
Thanks for your report, but as bug 33041 was specifically changed from Writer to UI in general by R. Bielefeld back in 2011, I think we can close this as duplicate.
*** This bug has been marked as a duplicate of bug 33041 ***
(In reply to Beluga from comment #2)
> Thanks for your report, but as bug 33041 was specifically changed from
> Writer to UI in general by R. Bielefeld back in 2011, I think we can close
> this as duplicate.
> *** This bug has been marked as a duplicate of bug 33041 ***
Got it, and sorry I missed that. Thanks for the correction.