Can we limit Window Manager to load Intel iGPU only? (hotplug Nvidia without stopping SDDM/GDM)

I have this laptop (Surface Book 2), a Intel iGPU and Nvidia dGPU.

Whenever I need to update the Nvidia driver/ hotplug the dGPU. I need to first systemctl stop sddm.

I thought the WM/DE only use my iGPU. (sorry for bringing Win logic here)

I'm using Arch & Fedora. Plasma/Gnome+Wayland.