How do you turn off background apps

So I have a samsung amp prime and in the device maintenance said I could stop apps from running in the background and its not when swipe to get rid of the recents and its an app called wattpad that I accidentally stopped it from running in the background and if you know what that is if you dont save a book you lose it and you have to find it and every time I exit out the app it goes out my recents so I loose all the books I forget to save and I want to know how to make it go back to running in the background

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