How to stop read report confirmations on Galaxy S6?

[AC Question]

Every time I send a group message, I get a pop up that says

"Confirm
Read report will be sent."

with the option to press Cancel or OK.

I've already gone to the settings and have turned off the delivery reports option for both text messages and multimedia messages. Having this pop up every single time I send a group message is annoying, is there any way to turn it off?

Thanks