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Back when we still had three finger pinch I deactivated the slide 3 fingers thing because three finger pinch to edit menus was much more useful. For screenshots I used the power + menu buttons or just used the toggle from the notification shade. But with MIUI 10 that pinch feature is gone so I left 3 finger slide on now. Luckily I did most of my homescreen editing in my older phones so I don't really need to edit homescreens these days anyway. Still it was a dumb idea to remove that feature just to have some gesture feature to take a screenshot. I mean if you really wanted a gesture there are plenty of other ways like Samsung's the bottom of your hand across the screen (also dumb) or wave at your screen like on OnePlus.