Some people will display their personalized signatures on my message bar as soon as they modify it, and then click on the page to chat with them. When they see a sign, click View from the chat bar. There are two situations: one will jump directly to the space, and the other will jump to the historical personalized signature interface. If you jump into the space, the other person will know it by checking the visitor record, but you won't know it if you don't check it, and the second person will definitely not know it.