Q-See QSD6204 - Manual (Page 39)

B. Record Mode
If you press the “REC” button, the DVR goes into “REC” mode. The DVR will
start recording based on set “Record Schedule”. In record mode, you can change
channel view and switch the audio channel. However, you cannot playback while
in record mode.
C. View Control
SINGLE
OR
MULTI-SCREEN
VIEW
Cam 1-4
In EACH mode, you can use the following keys to select the
camera that you want to see in full screen during playback.
Each View button controls FULL SCREEN display for the
selected channel (From cameras 1-4)
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