Steps: 

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• Open the dashboard in Data Studio - Click on the Google Data Studio icon to open report

• Swap from View to Edit mode - Click on the Edit button on the top right of the screen

• Select Manage added data sources from the resources menu

• Find the data source containing Project Name - Campaign/Placement - Blended, and select Edit.

• In the edit data source view, select refresh fields - located on the bottom left of the screen

• A pop-up will open which should automatically detect the date range formatting, select continue.

• Close the manage data source view by selection Done

• Finally refresh data to ensure changes have been successful.