Pixma Pro 100 keeps printing in 4x6

[harmstrong]

Despite what paper size I choose to print on, my Pixma Pro will only print 4x6. I have another printer that is printing what size I choose. Right now, labels are an issue. I'm printing from a pdf file here

[Stephen]

Hello!

So that the Community can help you better, we will need to know about any error messages you're seeing, and the Computer Operating System you're using (Windows Vista/7/8/10/11 or macOS 10.x/11/12), as well as the way you connect to your device (USB or WiFi).

Any other details you'd like to give will only help the Community better understand your issue!

If you're in the United States, and this is an urgent support need, please click HERE to visit your My Canon Account to discover your personalized support options. 

If you're outside of the USA, please click HERE to find support options in your country.

Thanks and have a great day!