Optoma Geo Module BE-BWM01 - Manual (Page 8)

19. The corners can be adjusted either by dragging the points, adjusting the arrows or by
entering values (and pressing enter to confirm) - It can take a few seconds to update,
so be patient if you need to make a lot of adjustments. For a horizontal blend it is
usually a good idea to start by getting the vertical alignment correct before adjusting
the horizontal.
20. Click the "Back" button and repeat the process for Projector-02. You may need to
swap back and forth a few times to get a good result.