The developers have actually included a toggle to disable the QR code, but it is buried in advanced settings. Follow these steps:
This write-up explains what this QR code is, why it appears, and permanently. video downloadhelper qr code remove
If the settings toggle is missing in your version, you can downgrade to a legacy version that does not include the QR code prompt. This method requires caution: The developers have actually included a toggle to
Free, no watermark. Cons: You may not get the absolute highest resolution (usually capped at 1080p or 720p on some sites), and the format why it appears