To blend data in Looker Studio between the Google Analytics data source, provided by Google, and the Bing Ads data source by Windsor.ai:
1. Add both data sources to the report using the Add data menu button twice:
2. Open Resource ➡ Blends ➡ Add a Blend to blend the two data sources
3. Select the dimensions and metrics to use for Google Analytics
4. Click “Join another table” and select the Bing Ads data source
5. Select the dimensions and metrics to use for Bing Ads:
6. Click Configure join and select a Full outer join using the column Date:
7. Save the blended data source and start creating charts using it: