4-finger-swipe doesn't switch between apps anymore!

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I was really disappointed when I realized there was no way to use multi finger gesture to quickly switch between applications
any one know how to re-enable this function?
I really hope apple will include this option in the next update

 

[S.B.G]

If you press the tiny drop down arrow, you will see an option to change the Swipe between full-screen apps from three to four fingers.