You will see this alert at your next login if you already have an account.
By clicking on the notification, you open the Settings / General page, where you can enable the Samples Models feature. This setting is enabled by default for new accounts.
When you activate the Samples Models feature, a SAMPLES section appears at the bottom of the workspaces pane. Today, we have one workspace with sample models, but the list could grow in the future.
The Sample Walkthrough workspace contains two copies of the same model: the first has the initial model with all the issues detected, and the second is the result of several iterations described in the documentation.
We hope this feature will help you evaluate DAX Optimizer before buying the service for your models!