Editing Question Pool Slide in Captivate 4

The Apply to All option does work for most quiz question slide elements including question title, question text, question answer (but be careful with that one), each type of button (submit, skip, clear, back, etc), review areas, progress area, success caption, failure caption, incomplete caption.

Captivate sees each as a different type of object.  So if you position or resize one on a given quiz slide and then Apply to All, it will apply those size and positioning settings to all the other objects of the same type on other question slides.

I've used this feature quite a bit to get all question slides looking like they belong to a set.

Of course Cp5 also gives you even greater control with object styles...but you only asked about Cp4.