Is there a way to prevent kick/ban messages for all in the chat?

Are you using a plugin for kicking/banning? If so, then that's likely something you'll need to check with that plugin for; otherwise you'd need to use a plugin.

I don't use a plugin and I didn't find one here that allows me to hide those kick/ban messages in the chat.
Is there one?

https://umod.org/plugins/secure-admin

Has an option to broadcast/show/hide the bans and kicks via config.

Thank you very much.