Apps disappear in but still installed?

Hello! So I can't find my mail app(stock one) on my Huawei P10 Plus and also my Hisuite app I downloaded from the play store. They are installed and appear in settings but they don't show up on the home screen and in the app drawer. What should I do? I am using Nova Launcher Prime but on my Huawei Home launcher the stock launcher they appear. How do I make them reappear in Nova as well?

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