Swapping between open apps

Just found this cool little trick out the other day. For anyone with an iPhone without the home button (not sure if it matters what iOS you have but I know it works on 13) if you swipe either left or right on the black horizontal line at the bottom of the screen you can switch between any open apps. Not sure if I’m just an idiot and never knew this but it seems none of my friends knew about this either.
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