If you don’t want to be in a Group Chat, you can easily leave the group. Here’s how:

Navigate to the bottom menu and locate "Chat" and click on it to enter.

Select the option “Group” from the menu at the top.

Click on the group name beside the group display picture and you will see the Group Information.

Select the option “Exit Group”  at the bottom of your screen.

Select the option “Leave”.

You have successfully left the group!