Minecraft server plugin chat?

Namely how do you get it that if you press Tab everything is suggested.

Like here:

Is that a plugin that does that or am I stupid

For me it is like this:

(Yes, I know, stupid question

What do you mean with everything proposed?

This is always the case in newer versions (1.13+). However, your client (probably Badlion) may remove this feature through their own chat.

Deactivate the new chat function in Badlion Client Settings Other

So thank you. I found out that another profile works but when I use my main profile and issue it nothing changes.

Thanks again for your answer. And the other one too