Hi hi! I love advanced chat, its super helpful! I'll try to give you a crash course, but if you have questions feel free to dm me, my discord is arkkwolf. Assuming you already have it added, this is a little guide for adding chat windows.
Step 1 - Open chat and go to settings at the bottom right corner
Step 2 - Click "HUD" then "chat tabs" and a blank menu will come up (in my case I already have various windows already set up). Click on new chat tab, and go to the "configure" that appears.
Step 3 - Turn "forward messages to main" to false, name the channel (i.e. OOC) and then go to matches
Step 4 - Here you will add "matches" which basically filter which messages come through. In this case, you can add [LOOC] for looc chat or [OOC] for ooc chat.
Step 5 - Exit out of settings and open chat once more. Click the + and the tab you just created, and a window will appear which you can size to your liking.

Step 6 - if you have any more questions please DM me!