The device uses AMD Smart Access Graphics to automatically switch between integrated and dedicated depending on if it detects something it thinks will benefit from the discrete GPU.
I think (although am not 100% sure) that the system will automatically use only the integrated GPU when set to “Best power efficiency” in the system’s power settings and the laptop is unplugged.
It is also possible to configure what applications trigger the discrete GPU. Here’s a guide for it from a quick Google search. That was with Windows 10 and an older GPU, but I think the process is the same.