I suspect that you are not using the same Archicad build on the two macs. In the latest Hotfix (1010) we touched this area. When you publish layouts (and ONLY layouts) then the page options button and settings are completely useless, because all the page settings are inherited from the master layout.
In pre-1010 versions, if you published a single layout, then the page options button was (correctly) removed from the navigator, but when you published more layouts, then it (incorrectly) stayed there, as seen on your Macbook screenshot. Your iMac is probably up-to-date (hotfix 1010 is installed), and therefore the button is (correctly!) not there. On the macbook you still have the button - but it does not do anything.
If you publish views instead of layouts, or you publish views AND layouts, then the page options settings are affecting the output of the views, but it never has any effect on layouts - you set that up in the master layouts settings.
Gergely Kmethy
VP, Customer Success, Graphisoft