so i instal nick plugin, but essentials overwrite this plugin and that plugin not work.
have change-displayname: false but that not help
ps sorry for my bad english

you might need to turn off your essentials nickname with /nick off before using the other one. otherwise, it might be a problem with the other plugin.

ok i fix it and now nick plugin work but essentials overwrite /nick command so i can't use /nick command from my nick plugin

You can remove the nick command from Essentials via the commands.yml file in your server.