Yeah, that may even be a better way!
Express if you like or do not like the new version of the site

I am V3 now watching the match. Why can't I turn off the chat box? Can't find a button for that. It is annoying.
I don't think you can turn it off, at least I couldn't find a way, but you can restrict it so much that it's all but off by selecting "friends" only:
Tried that. I don't have friends but it is still showing a conversation.

I am V3 now watching the match. Why can't I turn off the chat box? Can't find a button for that. It is annoying.
Switch to the Twitter tab
No help there. Where is the "close" tab? Put one in if there isn't one.

Pesky users, wanting to modify the zoom level and thus screwing up the nice clean design...how dare they!
OK, I just had a little time to test. If I hover over the right side of the right panels, my cursor changes to a resize icon (like it would in for a normal window element). You can click-drag left or right, though it is a little finicky.
Before:
After:


Forward a screenshot of the missing icon(s) to the developers.
If that rather perfunctory comment was aimed at me, then I have been troubleshooting this issue for some time now with one of your software developers, Martyn Chamberlin.
I have done everything asked of me...provided details of my computer settings/versions, changed my browser, reloaded profile etc, to try and fix a problem of chess.com's making.
I'm a paying customer and am now officially pissed off and done, good evening to you.

It's true that V3 and all this unending story has triggerred a lot of people including me too why don't we just forget V3 and live happily ever after using V2 only?

Open up a suggestion ticket or forum for that.
where do I get a ticket? I think the people who I am seeing in the chat box (which I cannot close) are the moderators. Rensch showed up too.

I am V3 now watching the match. Why can't I turn off the chat box? Can't find a button for that. It is annoying.
I don't think you can turn it off, at least I couldn't find a way, but you can restrict it so much that it's all but off by selecting "friends" only:
Tried that. I don't have friends but it is still showing a conversation.
That's odd. Here's what I show.

I am V3 now watching the match. Why can't I turn off the chat box? Can't find a button for that. It is annoying.
I don't think you can turn it off, at least I couldn't find a way, but you can restrict it so much that it's all but off by selecting "friends" only:
Tried that. I don't have friends but it is still showing a conversation.
That's odd. Here's what I show.
Right. See AnnaEA? There are a couple others that show up. Moderators I think. Need a 'close' or 'disable' buttton.

Open up a suggestion ticket or forum for that.
where do I get a ticket? I think the people who I am seeing in the chat box (which I cannot close) are the moderators. Rensch showed up too.
https://support.chess.com/customer/portal/emails/new and chose Site Feedback. You could also/instead open a topic about it in the Site Feedback & Suggestions forum.
Won't help for the championship but might for the future.

I hope that the old version will not be closed!
The new version for small screens like a smartphone.
I agree with the fact that the new version is faster. Faster page loads. However, I am using the correspondence chess (rarely I play online, I prefer off-line) because the speed of the page is the last element for which I pay attention. The most important is functionality.
The old version is more convenient for the PC. It is more convenient layout (GUI) colors.
I hope that the old version will always be available (eg. In the settings), and will not pushy automatic switching to the new version.

@xming, OK - I saw found the 👀 eye icon and could filter chit-chat. However, I wonder if that is a premium function, and that may not be why he's able to set it?
Also - the V3 version of Chess.tv is ... atrocious. The black pieces are hideous. The V2 version of Chess TV used the player's board settings (or they could be set). The V3 board is too oblong-tall ⇡⇣ to fit nicely in to my PC-sized browser window 📺 .. it is uncomfortable compared to what we had in V2. Any way to revert back to the old days for Chess TV???
📺

...
Also - the V3 version of Chess.tv is ... atrocious. The black pieces are hideous. The V2 version of Chess TV used the player's board settings (or they could be set). The V3 board is too oblong-tall ⇡⇣ to fit nicely in to my PC-sized browser window 📺 .. it is uncomfortable compared to what we had in V2. Any way to revert back to the old days for Chess TV???
📺
You're not talking about the championship games are you? I don't normally watch the TV offerings but I don't think that has changed much between versions; the championship is a different story since they are using the official widget from the official site.
I am V3 now watching the match. Why can't I turn off the chat box? Can't find a button for that. It is annoying.
I don't think you can turn it off, at least I couldn't find a way, but you can restrict it so much that it's all but off by selecting "friends" only: