Selecting the Paper Settings for Each Source

You can change the default paper size and paper type for each source using the control panel on the product.

Select Settings > General Settings > Printer Settings > Paper Source Settings > Paper Setting. You see a screen like this:
Select a paper source.
Select the size and type of paper you loaded.
Select the back arrow to select another paper source or press the home button to return to the Home screen.

Selecting the Paper Settings for Each Source - Control Panel