This is the most relevant entry I found related to the 3D view:
“What About 3D View?
The 3D PCB view is optimized for a high-level, realistic visualization of your board. It doesn’t include layer selection controls. Here’s what you can and can’t configure:
What You Can Do in 3D View:
Rotate, pan, and zoom the board to inspect the overall geometry.
See stacked vias, components, and general board structure.
Visually confirm copper pours and silkscreen placement.
What You Can’t Do:
You cannot toggle individual layer visibility.
You cannot hide or isolate specific copper layers or metadata layers (like net or DRC overlays).
If you need to inspect specific layers or debug layer-specific issues, switch back to the 2D view using the View Mode toggle in the top toolbar.”