Thanks to a new WhatsApp feature, only the group admin will be notified when you leave. To leave a chat, simply press and hold the chat on Android. Next, you must click on the three-dot icon in the upper right corner of the screen and there you must select the option you want already. Then you will see a message on the screen saying “Your leaving the group will only be notified to the group administrators”.
On iPhone, swipe left on the group you want to leave. Then you need to click “more” and then select the option to exit.
Source: Ferra

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