Is there a way to turn off the BI Engine feature when using Data Studio? My goal is to compare and analyze the value add of BI Engine, like before and after using the BI Engine to accelerate the data studio charts.
If your data is under 1Gb, then your dashboards would be accelerated by BI engine by default using free tier: https://cloud.google.com/bi-engine/pricing#free_tier
If your data is smaller than 1Gb, there is no easy way to disable it today. One way you can workaround that is to use custom query and check "Legacy SQL" checkbox in Data Studio: screenshot. That way BI Engine won't be used.