Please stop creating new issues with just a title.
Instead, use a single issue and describe your problem such that we can understand where you are stuck and can help you. It usually helps if you describe what you already have achieved and possibly show the code you already have.
Regarding the current question. Am I correct assuming that you can successfully create a QR bill but it is not in A4 format? If so, you probably just need to change the output format:
Please stop creating new issues with just a title.
Instead, use a single issue and describe your problem such that we can understand where you are stuck and can help you. It usually helps if you describe what you already have achieved and possibly show the code you already have.
Regarding the current question. Am I correct assuming that you can successfully create a QR bill but it is not in A4 format? If so, you probably just need to change the output format: