Use the gamerule 'commandBlockOutput'. The command is - /gamerule commandBlockOutput false . This will remove any annoying chat messages.
Chat with our AI personalities
You always type commands into the chat window but if it's a valid command, it won't show to other players. If it's showing to other players, the commands might not be configured/you might not have the proper privileges.
On a Minecraft server, chat is always on. If one of your friends can't chat, then it is a problem on their end.
Yes. Go to multiplayer settings > Chat= off.
The deafult key to open the chat is T.
T by default.