I know of this elite haxx for this and it's not very well known.
Step 1: cut 3x3 section of tape of your choice. Rumor has it duct tape works best.
Step 2: apply 3x3 section of tape to lower left hand corner of your screen.
Step 3: some say this step is optional but I don't think it is. Grab a heat gun and hold over tape for 20 seconds on high. This really ensures you will not have to see chat on your screen.
Step 4: share these steps with friends, so they too can enjoy the absence of chat on their screen.
Step 5: open chat menu and click leave chat.
You're welcome.