extend desktop with dual monitor

marcelo.diaz.ar

Bit poster
I have a thin client with dual monitor ( vga and hdmi) I need extend the desktop, but not work.
I set DISPLAY in SYSTEM PREFERENCES . I set ENABLED DUAL MONITOR CONFIGURATION and EXTEND DESKTOP TO SECONDARY MONITOR.
I see the same on both monitors, but I need to extend the desktop.

Can you help me.
Thanks.
 
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