LG G3 D855 how to deactivate quickstart of camera app

My wife is using the G3 now half a year and she manages to finish a full battery in half a day - I bought a new battery, but it did not help. I found out now, that she is all the times opening the camera app with double click of the power button.

I do not find the option, where to deactivate that?
thx for your help

Regain your privacy! Adopt /e/ the unGoogled mobile OS and online servicesphone

sorry - finally found it . its in system

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