Articulate Engage lets you customize several properties for each interaction, including navigation options, colors, animations, sound effects, fonts, quality settings, and more. The following tutorials will show you how:

Playback Mode
Interaction-Specific Properties
Theme Colors
Animation Style, Media Border Style, Sounds, and Fonts
Quality Settings

If an interaction is part of an Articulate Presenter course, you can also control how it interacts with the rest of the course. See this tutorial for details.