How to select items to edit in crowded build slides

New to Keynote:

I'm doing build slides that have multiple text fields and graphics moving in and out. When I need to edit text items, they appear all at once and it's very difficult to select the one I'd like to edit. For example, a text field I want to edit may lie beneath three or four others when the slide is in edit view. When the presentation is played, of course they build in and out as needed and there's never a superposition problem - but they aren't editable during play.

Is there a straightforward way to separate or select these superimposed elements of a slide so I can edit them? Thanks.