Let me show you the 8.027 version of Apple's mobile phone WeChat.
1. Open the WeChat of Apple's mobile phone first, then find the group chat and click, as shown in the figure below:
2. Open the WeChat group chat page, and then select three points as shown in the figure below:
3. Then drop down to the bottom and select Clear Chat Record, as shown in the following figure:
4, and then return to the group chat page, you can see that there is no chat content, and the group chat record is cleared successfully, as shown in the following figure: