To turn off background app refresh in android just need to follow these simple steps:
Firstly open your device setting.
Then click on the “Apps» tap if you have an old android device But in the latest click on”Apps and Notifications”.
When it opens then click on “All apps”.
Then click on Data usage or Battery.
Then click on disable background activity.
By following these simple steps you can turn off the background app refresh in android.
read more:- https://techyvibe.net/background-app-refresh/