How to stop your Samsung phone from killing background apps

This step-by-step tutorial will show you how to stop your Samsung phone from killing background apps.

Open your phone's settings.
Scroll down to Apps and open it.
Tap on the three-dot menu icon located in the top right corner of your phone's screen.
Tap on Special access.
Tap on Optimize battery usage.
Tap on the drop-down arrow next to Apps not optimized.
Select All.
Find the app or apps you want to keep running in the background and tap on the app or the toggle button next to it to turn it off.