It appears your question is in regard to "Delayed Locking" page 36 of the Owner's Manual (mine is 2017).
This is where it shows you how to engage the feature and it then mentions page 134 for settings in the
Driver Information Center (DIC) and what is referred to as "personalization".
It is on the Screen Settings that you will find options which includes
"Power Door Locks" and "Delayed Door Lock" which is likely just an "On" or "Off" Setting.
You will need to set (guessing "Off") and then test as I have not actually tried it.
Although I first tried it out originally, I no longer use auto-lock as I am just too old-school
and have to hear the horn beep by pressing my remote "lock button" and then OCD makes me do it twice ...
When asked "why the second beep?", I just tell my Wife it's my car saying "I'm good and see you soon"
(or maybe that would be on the third or fourth in the succession of beeps
)
My Wife used the auto-lock feature on her C7 ... but only for a while ...
she discovered
I was just using my remote so that I could hear the "beep(s)" as we walked away.