Multiple chat windows
 

All mmo i played when i had the opportunity to create multiple chat windows i would create one for player chat and other for system miscellaneous, place them one on top of each other and be happy.
But you cant do it in this game, is there a mod for it? Couldn't find one.

There used to be some but I think they are non working anymore, e.g.:
https://www.esoui.com/downloads/info...orUpdate5.html

You could try to use an alternative chat addon like TOM, if it provides usage of TOM's chat window and standard chat window at the same time.
You'd have to test it please.
https://www.esoui.com/downloads/info...Messenger.html