For all stereo data types Stereo Viewer has the appropriate option to show only left, right or both frames from the data stereo pair.
This option is available on the right program panel in section 'Mono mode':
Open movie that with 'Frames Shift' split type and set 'Frames Shift' value to 5:
Stereo Viewer on the screen shows first movie frame.
If we change 'mono mode' to 'right', Stereo Viewer will show 6th movie frame:
And if we change 'mono option' to 'both', Stereo viewer will divide central widget and will show 1st movie frame at the left widget half and 6th movie frame at the right widget half: