In your application, there is code that sets the display mode to horizontal stereo. There are various ways to initialize this stereo mode. One way is to call a specific HMD command. For example the following configures the display output for an nvis HMD:
Code:
import nvis
nvis.nvisorSX()
Another way is initialize stereo in the viz.go command:
Code:
viz.go(viz.STEREO_HORZ)
You'll need to find where the stereo is set and remove that code to run in mono mode for a desktop display.