Application in the background settings?

I've recently got a Huawei Mat 20 pro. Best of all, I'll just come right away…

If you have opened an APP on the phone and then go out and choose another application, then the APP runs where in the background. And if you want to delete the previous application, that's easy. But as a rule you can see in the previous applications where you are stuck. But that's not the case with me. At the beginning it still worked but suddenly I did not see anything. How can you change that?

I know is hard to understand, dsrumm as little Hilde a screen of it. And in the rules one should see, where one has listened.

Thank you

Does the app also restart every time? For me that came after the update to emui 9.0, you have the apps in. Allow the background to continue running

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No, the app keeps running where I heard it