Cannot install windows in upboard internal memory

Giammy

Hi, i have to install windows, i have burn win10 official iso on usb drive with rufus (GPT partition) and i am able to start the upboard with windows installation.
But when i am on the installation disk selection, it show me the (i presume) internal 32gb memory (Unit 0 partition 1) but i cannot format and cannot continue with installation, i have to change partition type? Or what can I do?

Thanks a lot!