According to the UK user handbook, a single flick upwards on the wiper stalk activates the wipers in "normal" mode, i.e. not sensing. The dial on the stalk adjusts the interval.
Copied and pasted from the handbook
Note: The lever returns to the basic position when released.
▷ Normal wiping speed: press upwards once. When the vehicle is at a standstill, the wipers switch to intermittent operation.
▷ Rapid wiping speed: press upwards twice or press once beyond the resistance point. When the vehicle is at a standstill, the wipers switch to normal speed.
▷ Flick-wiping: press downwards once.
▷ Switching off normal wiping speed: press downwards once.
▷ Switching off fast wiping speed: press downwards twice.
Turn the knurled wheel to set the interval time or sensitivity of the rain sensor.
Up: short interval or high sensitivity of the rain sensor.
Down: long interval or low sensitivity of the rain sensor.