ETC Congo Family v6.4.0 - Manual (Page 212)

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System Settings - Monitor
System Settings - Monitor
Max physical monitors
Select the number of physical monitors you want to run your system with. If you are running
an offline version you can choose virtual screens.
Monitor 1
Check this enable box to change Placement (left/middle/right) or Mode (resolution).
Monitor 2
Check this enable box to change Placement (left/middle/right) or Mode (resolution).