No chatoutput in tellraw onClick Event [duplicate]
Solution 1:
First note that when using /trigger (which you should for JSON if you want non-OPs to be able to use the menu) only players in creative will see the "Trigger NAME changed with set 1" message.
If your players are in creative mode and you don't want them to see the message, then you can turn command feedback off via the gamerule:
/gamerule sendCommandFeedback false