Ok,Maybe we are reading two different things? As I said earlier, it adjusts at what point the wipers are triggered. Level 1 waits a little longer (more rain buildup on the windshield) and level 2 is quicker on the trigger.
I think it is stated clearly, although it’s wordy:
“Want to turn them on intermittently when a medium amount of rain has accumulated? Choose Auto 1 option on the wiper lever”
Or choose the more sensitive Auto 2 option if you prefer wiping as soon as the vehicle senses just a light mist or drizzle, such as when you’re driving out of the garage on a foggy morning. To make sure the windshield is clear, the wiping speed will automatically adjust based on how much rain accumulates between each wipe.