Hello there,

I just got the Infinix Note 5 that runs Android 8.1 but I noticed there is no recent apps lock (Common in Hot 4 and 5 models) which is quite frustrating. I need to lock one very important app in the memory so that it'll forever be active even in the background, but Android keeps closing all my apps when the screen locks. Does anyone know if there is a method of activating this on Oreo? Or any way to stop the specific app from being killed? I've tried disabling Battery optimization for the app but it still ends up being killed.
Thanks.