Why is my app hide system is not working anymore? How can I enable it again?

[AC Question]

I use Huawei gr5 2017 phone with EMUI 5. It has Android 7.0. There is a system that we can call "app hide". If you swip home screen with two finger then the hiddep apps appear. But from last night that isn't working anymore. All of my hidden apps are at home screen and I'm tired of swiping but it's not working.
please help me.

Thanks
Sharzil