You don’t. You click right or left.
This is what the manual says:
" The button at the end of turn signal stalk has two levels.
- Press partially to wipe the windshield. If the wiper is already operating at a wiper setting and is not set to Auto, pressing the button cycles through speeds. Wiper speeds cycle as follows: I > II > III > IIII > III > II > I."
It goes on, after describing the washer operation (correctly) with this:
"Whenever you press the wiper button, the touchscreen displays the wiper menu, allowing you to adjust wiper settings. Roll the left scroll button on the steering wheel up or down to choose your desired setting."
This is entirely different than your description. You seem to be saying that the owner's manual is wrong. My experimentation indicates it is wrong, as well. Rolling the scroll button up and down does not work in my car to control the wipers. Pushing the ball right or left changes the wiper speed. Fortunately, the speeds do not cycle, as you indicated, but instead, progress from off to speed 4, click by click, and stop at speed 4 if I continue to click to the right.
In any car, the wipers are a safety feature. They are not there for amusement. So defective wipers systems are a safety issue, despite your protests to the contrary. The Tesla system is, in the words of Electrek, "notoriously bad". In my experience, which runs to only a couple thousand miles with my MY, the wipers have never functioned adequately in auto mode, always failing to reach high speed appropriately in very heavy rain, and usually operating unpredictably in lighter rain as well, seemingly picking wiper speeds at random, and only rarely with any strong correlation to precipitation rate. When I tried to set up an appointment to get the system fixed, Tesla said that the issues were known, and that they were working on it, so they did nothing to fix my car.
I have owned about 50 cars over somewhat more than 50 years, and have never experienced worse customer service than with Tesla, and have never had a wiper system that was so unpredictable and cumbersome to operate. My work around for getting to high speed when I need it is to press the stalk end, then press the left scroll button to the right 4 times. This is five motions for accomplishing what can be accomplished in any other car in one motion.
Distracted driving is dangerous.