Hi shawon, thanks for your rating. It's great to hear that you like the add-on. 😀

The link preview as you name it actually is a feature, because you can enter any other text there to generate a different QR code. As such, we cannot simply hide it and if so, how would users know what text they enter and whether they can enter text?
For a longer explanation, please have a look at https://github.com/rugk/offline-qr-code/issues/253, where a similar feature has been proposed.
I hope this explanation helps to explain why it is done the way it is.

Apart from that, if you have further issues or questions, feel free to ask or suggest a feature by opening an issue on https://github.com/rugk/offline-qr-code/issues/. Thanks.
We track the feature requests there and of course people can also implement it then.

Best regards,
rugk