Article: It's in the upper-right corner of the screen.    Doing this deletes the messages contained in all chats on the device. Select this option if you want to preserve your chat history without the messages that take up so much memory. It's in the upper left corner. WhatsApp data is now cleared from your Android device.

What is a summary?
Open the WhatsApp app. Tap ⋮. Tap Settings. Tap Chats. Tap Chat history. Tap Clear All Chats. Tap ←.