I just updated to pie. And I'm a bit pissed off. You used to be able to choose whether or not the app screen comes up on a up swipe and an down swipe. But after about 45 minutes of searching (forums and the settings) I cant figure out how to get rid of the down swipe gesture to open the app screen. It's exceedingly annoying to go to open your notification bar. Miss only to end up in the apps screen.