Brother DCP-4020C - Manual (Page 166)

USING THE WINDOWS
®
BASED BROTHER SMARTUI CONTROL CENTER 11 - 26
Copy
The copy button can be customized to allow you to take advantage
of the features built into the Brother printer drivers to do advanced
copy functions.
The Copy button is automatically linked to the default Windows
printer driver. You can set any printer as the default printer including
non-Brother printers. Before you can use the Copy button you must
first configure the printer driver by right-clicking on a Copy button and
selecting Configuration.
In the Scan Settings window you can select the colour mode,
resolution, paper size, brightness and contrast settings to be used.
To finish the Copy button configuration you must set the printer
driver. Click the Copy options button to display the printer driver
settings.