Hide All Highlight Boxes in a Project On Button Click

Captivate on its own does not provide a way to do this but almost anything is possible in HTML5 output if you know enough JavaScript.

Alternatively, if you don't want to have to learn JavaScript, then the CpExtra HTML5 widget allows you to automatically execute certain actions based on the Object Name of a slide object.

More information here: https://widgetking.github.io/cpextra/variables/special-behaviour.html#syntax-and-syntax

So the idea is that you can use a prefix or suffix on the object name to indicate whether or not you wanted particular objects to be shown or hidden at runtime.