Even after the creation and customization of a Group Chat, it can be edited in its features, Display picture included.

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

Select the option “Group” from the menu at the top and select the Group you want to modify.

Click on the “Pencil” icon you see at the top of your screen;

Click again on the “pencil” icon on the top of your screen;

Select photo from your photo library;

Click on the option Save at the top right of your screen.

Your group display photo has been changes successfully.