This is a very simple control that allows you to get the URL for the app's CDS environment inside of a canvas app. You can then use this URL in a variety of ways. For exmaple, you could create links back to the entity's form for the given record.

In order to use use the CDS Environment URL, there are 2 main requirements:

1. You must use a CDS data source in your app. Without your app having a connection to the CDS enviroment, they'll be no access to the CDS environment from which this component can retrieve the environment's URL.

2. In addition to having a CDS data source in your app, the app must actually connect to the CDS environment. Retrieving data from CDS is the easiest way to establish this connection.

• Make sure you have enabled PCF control for Canvas apps in your environment. For instructions on that Click Here

• In the Power Apps Editor navigate Custom -> Import Components

• On the Import Component screen select the Code tab and Import the PowerAppsDev CDS Environment URL

• Open the Code components area in the Insert panel and add the PowerAppsDev CDS Environment URL component to the form.
  

• Click on the Component on the form and set the Properties for the component.

Use the cdsEnvironmentUrl property on the CDSEnvironmentUrl control to access the URL for your CDS environment.

Here's an example of setting the cdsEnvironmentUrl property to a variable named url and using it on a test label.