This Tutorial is for Nodekit version 0.7.3; also works for 0.7.4
check here for newer versions

In some cases the automatic adjustment of the drawing area fails and drawing is constricted to a smaller rectangle than the screen size. Here's how to fix this:

Step 1 - If you're in fullscreen Tagtool mode, press alt-f to change to the Nodekit view. In the Tagtool Patch, look for the CameraFitToContent Node that is connected to the Display Node (eg Display2:1). It's located kinda in the North-East of the Tagtool patch. There is more than 1 CameraFitToContent Node so be sure you have the correct one.

Step 2 - Change the “Norm” Parameter in the CameraFitToContentNode. Lower values mean bigger drawing area. Press 'Enter' to commit value. Example) My Norm value was '27' before I lowered it to '20'. Drawing size now matches screen size. Screen res for me is 1024×768 (shown in Display 2:1 node).