The goal of a flip turn is to eliminate extra drag and remove any unnecessary body movements to quickly change directions. (blog.bridgeathletic.com)
The standard, bigger wing creates extra drag along with its additional downforce, thus limiting top speed to 209 mph, according to Lamborghini. (automobilemag.com)
Having it available means the team can run slightly higher downforce than otherwise because the extra power helps to neutralise the extra drag. (wtf1.com)