How to change Nvidia settings in PRIME Render Offload mode?

I have a laptop with Nvidia Optimus technology (with Intel iGPU).

When I’m in Render Offload mode, I use Intel GPU as primary GPU, but I can offload certain applications (like games) with Nvidia GPU.

The question is: How can I set up common Nvidia settings in that mode? For example enable G-SYNC or enable G-SYNC visual indicator. In offload mode nvidia-settings doesn’t show any settings.

Do I need to manually add options to the config file in /etc/X11/xorg.conf.d/?