Secondly, click on the message record in the group.
Third, click more in the group chat record, as shown in figure:
Fourth, we switched to the answering machine at this time.
Fifth, select the group to clear, and then click the cross in the upper right corner.
Sixth, are you sure you want to delete the selected message record? If you choose Yes, it will be ok.
Seventh, click the right mouse button to chat and delete more records. You can delete all records.