Official guide on Background Execution Limits (new feature introduced in Android 8 Oreo) has a note:
Note: By default, these restrictions only apply to apps that target Android 8.0 (API level 26) or higher. However, users can enable most of these restrictions for any app from the Settings screen, even if the app targets an API level lower than 26.
I've looked through the Settings on Android 8 emulator and was unable to discover the option mentioned in guide.
Could somebody point me how to enable/disable Background Execution Limits for all apps in Android 8+ Settings?