Can I delete [Player]? I can try every command and can you print to me an example of an order?

When entering a parameter value you have to leave out the <> brackets.

To disable a title you can use the /chat group set command.

To disable the "default" group title:
/chat group set default TitleHidden true

Can you give an example

I did:

To disable the "default" group title:
/chat group set default TitleHidden true ​