Why is my GPU so BUSY when just setting at this MENU?

I also noticed today that my RTX 3070 graphics card is running at 98% in the menu, even though I have activated the low power mode. It makes absolutely no difference whether I have low power mode on or off! Of the 8.0GB graphics memory, 5.3GB are in use! The graphics card draws ±203 watts in the MSFS menu. In the Nvidia settings I have absolutely everything on global standard… How can that be?