Take "mobile QQ version V8.9. 13.9280" as an example. In this case, just manage the historical signature and delete it.

1. Open QQ, and click on the avatar.

2. In the avatar page, click the edit icon.

3. On the tab page, click the History tab to enter.

6. On the History tab page, click Manage.

7. Check the history tab to be deleted and click Delete 1.

8. In the pop-up box, click Delete.

In this way, the historical signature of your personal signature will be deleted and your friends will not see it.