What is Roku's secret menu and how do you unlock it?

Roku has multiple secret menus that will allow you to make changes to how it behaves and even adjust your ad preferences.

Roku has multiple secret menus that will allow you to make changes to how it behaves and even adjust your ad preferences.<p><img src="https://www.engadget.com/img/gallery/what-is-rokus-secret-menu-and-how-do-you-unlock-it/intro-1788528910.jpg" /></p>