I just buy a new Vostro 14 3405 for my sister. It comes with AMD Ryzen 5 3500U (with Radeon Vega 8 onboard GPU). My concern here is the VGA using 2GB of system RAM (out of 8GB RAM). Is there anyway to reduce it? I have already updated system BIOS to the latest but still cannot find any settings to change it.

(My sister only uses Word, Excel and watches YouTube on Chrome, not playing video games or using any graphics-intensive apps so she does not need that much of VRAM for VGA.)