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How to fix the issue where YouTube's full-screen mode doesn't work on Windows 10
There are many possible causes for the full-screen display issue on YouTube, some of which are listed below.
- Flash Player Issues
- Corrupted cache file
- Google Profile Issues
- Extension issues
- The Chrome version is outdated.
Basic troubleshooting steps
Restart your browser: A minor browser issue may cause YouTube's full-screen option to malfunction. Closing and reopening your browser may resolve the issue. A browser update may also fix the problem.
Sign out of your Google account: In some cases, this issue can be caused by a specific Google profile and its privacy settings. To check this, try logging out of your Gmail account and playing a YouTube video in full screen in your browser. This may resolve the issue.
Restart your PC: Restarting your PC can resolve many system-related bugs and other minor errors. This might resolve your issue. Try restarting your PC by following the guide on how to restart your PC.

Update Google Chrome: If you're using an older version of Chrome, you might encounter many problems, such as issues with YouTube's full-screen display. Chrome regularly releases updates to fix these problems and remove bugs.

Method 1: Clear your browser's cache.
Many users have reported that clearing their browser history resolved this issue. This deletes browser data and other cache files. If these files are corrupted, this problem may occur.
Note: To determine if this issue is caused by corrupted cache files, try running YouTube in your browser's incognito mode and then run a YouTube video in full screen. If that works, try clearing your cache and cookies in Google Chrome.

Method 2: Change Flash Player and content settings
Users using older versions of Chrome may experience this issue because they have two Flash players installed. These two Flash players can affect each other's performance, potentially causing YouTube's full-screen option to malfunction. This problem can be fixed by disabling one of the Flash players. Please follow these steps:
- Press the Windows key, 「Google Chrome」 Enter this, "open" Click here.

- In the address bar 「chrome://plugins」 Type this and press the Enter key.
- pepflashplayer.dll Find it, next to it "Disable" Click the button. This Flash player will be disabled.
The problem should be resolved. If you are using a newer version of Chrome, this issue may be occurring because Chrome is blocking the display of some content. This can be resolved by allowing Chrome to play protected content. To do this, follow these steps:
- In the address bar 「chrome://settings/content/」 Type this and press Enter. "setting" window "Privacy and Security" The section will open.

- Scroll down, "Detailed Content Settings" Click the options to expand them.
- "Protected Content ID" Click the options to expand them.

- Within a protected content ID, "Allow the site to play protected content." Options and "Allow sites to use identifiers and play protected content." Make sure the option is selected.

Note: If the problem persists, try disabling Chrome's hardware acceleration option. To do this, chrome://settings/system Go to [the relevant section] and, if available, switch off the option to use hardware acceleration.
Method 3: Disable extensions
Chrome offers numerous extensions to add functionality and improve efficiency. However, certain extensions can interfere with specific Chrome features, sometimes causing problems such as YouTube videos not loading in full screen. Disabling extensions can resolve this issue. To do so, follow these steps:
- Open the Google Chrome browser.
- Move to the address bar, 「chrome://extensions/」 Type this and press Enter. All extensions installed in Chrome will be displayed.

- To disable them, switch them off one by one. For example, the Request X extension will be switched off and disabled.

- After disabling all extensions, check if the problem is resolved. If you can play YouTube videos in full screen, then enable the extensions one by one.
- If you encounter problems after enabling a specific extension, you can disable that extension while keeping all other extensions enabled.
Method 4: Reinstall Google Chrome
If all other methods fail, this is your last option to fix the issue of YouTube's fullscreen mode not working. Reinstalling Google Chrome will resolve the browser issue and give you a new version of Chrome without any existing problems. Follow the guide below to do this.
Note: Before reinstalling Chrome, please create a backup of your bookmarks, passwords, and other important data.
- Press the Windows key, "Apps and Features" Enter the following: "open" Click here.

- "Search this list" On the field 「Chrome」 Search.
- Next, select Chrome and highlight "Uninstall" Click the button.

- once again, "Uninstall" Click to confirm.
- Now, press the Windows key, 「%localappdata%」 Enter the following: "open" Click AppData Local Move to the folder.

- Double-click the Google folder to open it.
- Right-click the Chrome folder as shown below, "delete" Select an option.

- Press the Windows key again, 「%appdata%」 Enter the following: "open" Click to navigate to the AppData Roaming folder.

- Navigate to the Google folder again and delete the Chrome folder as shown in the steps above.
- Finally, restart your PC.
- Next, download the latest version of Google Chrome, as shown in the diagram.

- Run the setup file and follow the on-screen instructions to install Chrome.
lastly
I hope this guide helps you resolve the issue of YouTube's full-screen mode not working on Windows 10.






