Locked out of printer preferences

Hi, I’m using windows 10. Purchased a brother MFC l-2750dw printer a few months ago. Everything was working fine until a few days ago, now I am not able to print multiple pages as I am locked out of the printer preferences and the preference is set to 1 copy at a time. I called brother, we have deleted, reinstalled the printer and the drivers and the problem still exists. Brother blames Microsoft and unable to assist me. Can anyone help? thank you

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