It will be helpful for you if you have a graphics card RTX, and you are not be able to turn on this function into settings of game.
Guide to Enable Ray Tracing (RTX Graphics Cards)
Firstly you need turn on the DirectX 12 Ultimate. Only after this you can use ray tracing.
If you can turn DX12U, you should update your system.
To make RTX on, your version of windows should be after 2004 (20H1).
Download this updater and let’s do it!
After updating you can see DX12U into the game.