Blackmagic Design DaVinci Resolve Advanced Panel - Manual (Page 181)

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At this point, you’ve set up a side by side view comparing two different clips.
You can choose to display up to four different frames in the Viewer, using the Source and VTR A, B,
and C controls in the PlayHeads window. The Viewer will show a two-up, three-up, or four-up view
as necessary to accommodate the extra PlayHeads you enable, all of which will be output to your
client display.
Color screen viewer with four playheads active