Blatantstateless
Deactivating an app has the same effect on energy consumption as deleting the app:
You can no longer see it on home screen/use it and it really no longer runs = no energy consumption.
Advantage over deleting the app: minor, as personal data is not ‘frozen’ like the app.
Deactivation of background activities via the context menu App info:
Mobile data usage/background data:
Allow battery usage of the app/background usage
Off = Restricted
On = Optimized (default) or Unrestricted (some messengers without own push service requires it)