blocks|key|4520366|text|你可以用广告块加。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4520367|添加一个过滤器|4520368|youtube.com###chat|blockquote|4520369|这将阻止支持聊天的DIV。|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]]|I|$]]

You can with Ad Block Plus.
Add a filter
<blockquote>
youtube.com###chat
</blockquote>
That will block the DIV that supports the chat.

blocks|key|4520129|text|对于普通的youtube.com，目前没有内置或简单的方法使YouTube聊天禁用/隐藏/启动隐藏。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4520130|“禁用现场聊天”引用的YouTube帮助在前面的答案是不相关的，因为它是帮助的人谁上传了流/视频，而不是谁播放视频。|4520131|更新2023年:这个http://youtube.com/tv不再在桌面浏览器上工作，只是重定向到正常的youtube。佩尔@安德鲁-t，谢谢你。|offset|length|4520132|有趣的解决办法，可能对某些人有用正在浏览为电视制作的网站的http://youtube.com/tv版本。这是一个更简单的版本的网站，剥离了许多功能，包括聊天目前。|blockquote|entityMap|0|LINK|mutability|MUTABLE|url|http://youtube.com/tv|1|https://support.google.com/youtube/forum/AAAAiuErobUJXpC55JwIj8?hl=en|2^0|0|0|A|L|0|0|0|G|1|T|L|2^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@$F|X|G|Y|1|Z]]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@$F|11|G|12|1|13]|$F|14|G|15|1|16]]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|S]]|T|$5|M|N|O|A|$P|Q]]]]

For normal youtube.com, there is currently no builtin or easy way to make the YouTube chat disable / hide / start hidden.
The &quot;Disable Live chat&quot; quote from YouTube Help in the previous answer is not relevant here, because it is help for people who upload the streams/videos, not for the people who play videos.
Updated 2023: This <a href="http://youtube.com/tv" rel="nofollow noreferrer">http://youtube.com/tv</a> no longer works on desktop browser, just redirects to normal youtube. Per @andrew-t , thank you.
<blockquote>
An <a href="https://support.google.com/youtube/forum/AAAAiuErobUJXpC55JwIj8?hl=en" rel="nofollow noreferrer">interesting workaround that may work for some people</a> is
browsing the <a href="http://youtube.com/tv" rel="nofollow noreferrer">http://youtube.com/tv</a> version of the site made for TVs.
It is a simpler version of the site that strips many features,
including chat for now.
</blockquote>

blocks|key|4520340|text|在聊天窗口底部单击“隐藏聊天”(Live)或“隐藏聊天回放”()：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4520341|📷|atomic|offset|length|4520342|从2020年到12-16年，没有办法通过Youtube设置来做到这一点。不幸的是就在界面上。|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://github.com/q2apro/gifs/blob/master/2020-12-16-Youtube-hide-chat.gif?raw=true|imageAlt^0|0|0|1|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@$E|S|F|T|1|U]]|A|$]]|$1|G|3|H|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O|P|-4]]]]

Click &quot;Hide Chat&quot; (Live) or &quot;Hide Chat Replay&quot; (Live Replay) at the bottom of the chat window:
<img src="https://github.com/q2apro/gifs/blob/master/2020-12-16-Youtube-hide-chat.gif?raw=true" alt="" />
As of 2020-12-16 there is no way to do this via the Youtube settings. Unfortunately just in the interface.

blocks|key|4520453|text|您可以使用改进YouTube！+--一个开源的浏览器扩展，可以以各种方式调整YouTube+:比如隐藏或折叠各种UI元素，比如UI的“实时聊天”部分(铬版+/+火狐版本)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4520454|安装改进YouTube！之后，通过单击扩展的→外观→sidebar→Live→“隐藏”或“折叠”按钮，隐藏或折叠右侧边栏中的“实时聊天”。设置截图：|4520455|📷|atomic|4520456|注:我没有加入“改进YouTube!”任何方式的浏览器扩展。我只是一个普通用户，想要分享OP关于“隐藏YouTube聊天窗口”的问题的解决方案。我发现这个扩展是一个相关的、有帮助的解决方案，因为我也喜欢在没有聊天窗口的情况下观看YouTube视频。|entityMap|0|LINK|mutability|MUTABLE|url|https://improvedtube.com/|1|https://chrome.google.com/webstore/detail/improve-youtube-video-you/bnomihfieiccainjcjblhegjgglakjdd/|2|https://addons.mozilla.org/en-US/firefox/addon/youtube-addon/|3|IMAGE|IMMUTABLE|imageUrl|https://i.stack.imgur.com/C1EhS.png|imageAlt^0|5|A|0|23|2|1|28|4|2|0|0|0|1|3|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@$A|12|B|13|1|14]|$A|15|B|16|1|17]|$A|18|B|19|1|1A]]|C|$]]|$1|D|3|E|5|6|7|1B|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1C|8|@]|9|@$A|1D|B|1E|1|1F]]|C|$]]|$1|I|3|J|5|6|7|1G|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]|R|$5|M|N|O|C|$P|S]]|T|$5|M|N|O|C|$P|U]]|V|$5|W|N|X|C|$Y|Z|10|-4]]]]

You can use <a href="https://improvedtube.com/" rel="nofollow noreferrer">Improve YouTube!</a> — an open-source browser extension that can tweak YouTube in various ways: such as hiding or collapsing various UI elements, like the “live chat” part of the UI (<a href="https://chrome.google.com/webstore/detail/improve-youtube-video-you/bnomihfieiccainjcjblhegjgglakjdd/" rel="nofollow noreferrer" title="Improve YouTube! Chrome version">Chrome version</a> / <a href="https://addons.mozilla.org/en-US/firefox/addon/youtube-addon/" rel="nofollow noreferrer" title="Improve YouTube! Firefox version">Firefox version</a>).
After installing Improve YouTube!, hide or collapse the &quot;live chat&quot; in the right sidebar by clicking the extension's button → Appearance → Sidebar → Live chat → &quot;Hidden&quot; or &quot;Collapsed.&quot; Settings screenshot:
<img src="https://i.stack.imgur.com/C1EhS.png" alt="screenshot of settings described above" />
Note: I have no affiliation with the &quot;Improve YouTube!&quot; browser extension in any way whatsoever. I'm just a regular user who wanted to share a solution to the OP's question about &quot;hiding the YouTube chat window.&quot; I found this extension to be a relevant and helpful solution, since I also prefer to watch YouTube videos without the chat window.

blocks|key|4549140|text|还有..。老把戏。右击铬>检查.选择代码并删除。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

Also... the old trick. Right Click on Chrome > Inspect ... select the code and delete.

blocks|key|4549338|text|我使用Clik删除Chrome浏览器上的元素扩展。对我来说很管用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|entityMap^0^^$0|@$1|2|3|4|5|6|7|C|8|@]|9|@]|A|$]]]|B|$]]

I use the Clik to Remove Element extension on the Chrome browser. It works for me.

blocks|key|4549037|text|来自YouTube帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4549038|禁用Live您可以在任何时候禁用Live，甚至在事件开始后也是如此。|blockquote|4549039|现在流:选择齿轮图标并取消选中启用实时聊天框。|unordered-list-item|4549040|事件:+Go；编辑>基本信息>高级设置。在“聊天”下，取消选中“启用实时聊天”框。|entityMap|0|LINK|mutability|MUTABLE|url|https://support.google.com/youtube/answer/2524549?hl=en^0|2|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$]]|$1|G|3|H|5|I|7|X|8|@]|9|@]|C|$]]|$1|J|3|K|5|I|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

From <a href="https://support.google.com/youtube/answer/2524549?hl=en" rel="nofollow noreferrer">YouTube Help</a>:

<blockquote>
 Disable Live chat
 
 <blockquote>
 You can disable Live chat at any time, even after the event has started.
 
 <ul>
 <li>Stream Now: Select the gear icon and uncheck the Enable live chat box.</li>
 <li>Events: Go ;to Edit > Basic Info > Advanced Settings. Under "Chat," uncheck the Enable live chat box.</li>
 </ul>
 </blockquote>
</blockquote>

YouTube started rolling out chats next to videos:

<a href="https://i.stack.imgur.com/F6ax1.png" rel="noreferrer"><img src="https://i.stack.imgur.com/F6ax1.png" alt="enter image description here"></a>

This is often/always(?) open when I start playing a video. 
It happens with live replays, recorded replays, and prerecorded videos (it is unclear to me when a video can have a chat).

Is there a setting to disable the chat, or have it start closed by default?

Can I permanently hide the YouTube chat window?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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YouTube开始在视频旁边推出聊天内容：📷这经常/总是(？)当我开始播放视频时打开。这种情况发生在现场回放、录音回放和预先录制的视频(我不清楚什么时候视频可以聊天)。是否有禁用聊天的设置，或者默认情况下启动关闭？

问我可以永久隐藏YouTube聊天窗口吗？
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