Restoring icons on desktop
My 2 year grandson has somehow hidden the icons on the bottom of our desktop.
Apple TV 4K, tvOS 16
Drag the cursor to the bottom edge of the screen and the Dock may reappear.
It's also possible that the Dock is hiding at either side edge of the screen... check by dragging the cursor to either edge and see if it reappears.
Use the Dock on Mac - Apple Support