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I've seen this on the Internet.
This is may work regarding the setting although this is for a G4.
From a Home screen, navigate: Apps icon Apps icon > LG LG apps folder > Messaging Messaging icon.
Tap the Menu icon Menu icon (located in the upper-right).
Tap Text message or Multimedia message.
Tap Delivery reports to enable or disable.
Note Enabled when a check mark is present.