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This is the updated camera app from the Huawei P20Pro's firmware, the version is that I used is Ctl-L29C33B120a (may 11 2018).
Installation(P10 and P10 Plus):
Just go to product/app and delete your current HwCamera2, and paste the new one into that folder, after that, reboot your phone and enjoy the new camera (I like the new design).