This message was posted on behalf of Intel Corporation
Thank you for contacting the Intel community.
Please bear in mind that your best support is with your computer manufacturer, in this case you computer manufacturer is Acer as they are more familiar with your system and how all the components interact with each other.
Based on the processor model, this processor only supports 2 displays as you can see here:
If you have a video card installed in most of the systems you will need to use the onboard video or the video card but you cannot use both, you can check in the BIOS if there is a setting to set it to work as the secondary adapter for multi-monitor support. I suggest you to confirm this with your computer manufacturer.