Yes, this seemed rather counter-intuitive to me at first as well. The solution is to create some custom agenda views. MobileOrg will push all the custom agenda views. So, in my case, I have created a 90 day agenda view, as follows:
(setq org-agenda-custom-commands '(("f" "Full quarterly agenda view" agenda ""
((org-agenda-files '("~/s/notes/diary.org"))
(org-agenda-time-grid nil)
(org-agenda-ndays 90)
(org-agenda-entry-types '(:timestamp))
)))
You could change the ndays element to 7 to get the next week's worth of days, say.
The agenda views on MobileOrg are static and are created by the org-mobile-push function on your desktop.