Hello Jialiang,
If this was within 10 days of the update, you could have use the "go back to previous version of Windows" feature to undo it, but it appears to be too late for this option.
You can use the method in the tutorial below to stop getting Insider builds, and continue getting updates when the public builds catch up. Otherwise, you would need to do a clean install of Windows 11.
https://www.elevenforum.com/t/stop-getting-insider-preview-builds-on-windows-11-pc.1967/