To set the dashboard into developer mode, you can use the developerTools property. This will allow you to see the components of the dashboard that you can override, and discover the text that you can alter.

{theme: true}

This will show you the path within the theme object that you provide via the theme property.

{componentOverride: true}

This will show you the name of the property of the Dashboard, that you can specify to override a component on the Dashboard. For more information, see the component override documentation.