fatadxb :
I did search the bios and I didnt find the option to enable it
It's there, according to the manual, in the Advanced Mode of the BIOS, in the "Advanced" Tab under "System Agent Configuration" -> "Graphics Configuration" and THEN "iGPU Multi-Monitor"
I just went off of how the BIOS is on my P8Z68-V LE, but it's
slightly different for your board, apparently.