To install sample data in Dynamics 365, go to Settings->Data Management:

Select Sample Data:

Click Install Sample Data:

You will see the message “Installation of sample data is processed in the background. You can continue to use Microsoft Dynamics 365”:

Close the dialog. Click to open it again. You will see the message when complete, “Sample data is installed on the system”. Note the option to Remove Sample Data:

Sample data will then be installed.
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