You might see a "Sample data" pop-up in the report if there are widgets that are not connected to a source. In this case, you will need to connect the source to the report in order to include the data that you need. Please see the steps on how to remove this pop-up.
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Step 1. Click on the "Change" button in the "Sources" section of the report:

Step 2. After choosing the source, click on "Save Selection" button: