It’s possible to adjust the “pickup” on the trace by clicking the Up and Down arrow keys on the keyboard during the trace operation. (Which can be used to get rid of that white patch in the middle…it’s caused by camera light reflections on large areas of solid black during the capture.)
Tips for using the Trace function are located here:
You can also try covering the little lights on the sides of the camera temporarily with a bit of tape, moving the paper out from directly underneath the camera on the bed, or lowering the ambient light in the room.