Yes it can be, options you are looking for is called "iGPU", this board is actually using GPU from CPU if it has one. Board doesn't have gpu on its self.
To disable it:
You must go in BIOS under Advanced - Graphics Configuration - iGPU Multi monitor - Disabled
Also you must select Primary Display and set it to "Auto" or PCIE
I personally don't mind to have iGPU enabled.
I guess it is best to use iGPU than a GPU used for mining?
That's exactly how I have setup my rigs.
On a rigs that have igpu options available, I'am using igpu as my primary display.
I have one rig with xeon that doesn't have integrated GPU, on that machine i have just pluged in HDMI on one of the cards.
But in that combination i have random spikes of GPU core frequency on card that has plugged hdmi cable.