What is the first step required to configure model-driven apps in Power Apps?

To configure model-driven apps in Power Apps, the essential first step involves signing into Power Apps. This initial action is critical as it establishes user authentication and grants access to the Power Apps interface. Once you're signed in, you can proceed to select an environment, where you can create and manage your applications.

Without signing in, you lack the necessary permissions and access to platform tools needed to progress to the subsequent steps such as selecting an environment or creating the app itself. Therefore, signing into Power Apps is the essential entry point that allows you to start the configuration process efficiently.