Where did the Display settings go in NVIDIA Control Panel?

Check the NVIDIA App. Look under System for display-related settings and under Graphics, then 3D Settings, for global graphics options. The layout has changed in newer versions, so the controls may not be where older guides show them.

On a laptop, which GPU is connected to the display can also affect which controls you see. Check Windows display settings and any software provided for the laptop's integrated graphics too. The NVIDIA GPU may handle rendering without directly controlling the screen.

There's also a reported workaround involving a driver older than 610.47, followed by an update without selecting a clean install. Whether that preserves the old Control Panel on a laptop is unclear, though, so I'd check the NVIDIA App first.