In July 2023, Microsoft began testing a new Windows recovery feature in the Canary channel, build 25905. The feature was called “Fix problems using Windows Update” or “Fix problems using Windows Update".
Microsoft knows that Windows repair and recovery is essential, as the users they often get in trouble for her.
Microsoft recently published a support article on “Fix problems using Windows Update” explaining how it works:
Windows Update can help you fix problems with your computer. Fixing problems using Windows Update is a recovery tool that can help fix problems related to updates. Using this tool will reinstall the current version of Windows on your device. This tool keeps all your apps, documents and settings. Be sure to keep your computer connected to a power source and to the internet during the restartinstallation.
Thus, it essentially runs an on-site repair of files system and Windows components by reinstalling the operating system through Windows Update.
Η company also posted a step-by-step guide.
Select Start > Settings > System > Restoration > Fix problems with Windows Update. 
After you choose Reinstall now, select whether you want to allow the computer to restart automatically 15 minutes after the installation is complete.
Select OK when you are ready to begin the installation
Reinstall will take you to its page Windows Update at Settings. It will start λήψη a patch version of the latest operating system update that was successfully installed on your computer. Once the download is complete, the patch version of the update will be installed.
Once the reinstall is complete, restart your computer if you chose not to allow automatic restart
Microsoft states that if an update fails to install due to problems related to files or system components, the following message may appear on the Windows Update page in Settings:
Select OK when you are ready to begin the installation. When the reinstallation is complete, restart your computer.
However, while this feature is useful, it's not for everyone.
Microsoft says it's only available on Windows 11 version 22H2 and later that have the optional February 2024 update or later installed. In addition, managed computers such as those in business or school will not have the above functionality.
You can find more details at official Microsoft support article.
