How to Revert Windows 10 Anniversary Update?

How to Uninstall Windows 10 Anniversary Update

Use the Windows key + I keyboard shortcut to open the Settings app.
Click Update & security.
Click Recovery.
Depending on your previous version youll see a new section called “Go back to Windows 8.1” or “Go back to Windows 7”, click the Get started button.

How do I Roll Back from 20H2 to 21H1?

How do I switch back to the current version? If you want to go back to 20H2 then Select Settings / Update / Windows update and click View update history. On top of history page is "Uninstall updates". Click that link.

How do I Rollback a Windows 10 Update?

Press the Windows key + i to open Settings.
Choose Update and Security.
Click the Update History link.
Click the Uninstall Updates link.
Choose the update you want to undo.
Click the Uninstall button that appears on the toolbar.