Field of view
Center important content within the field of view.
- Upright viewing
- Angled viewing
Avoid anchoring content to the wearer’s head.
Depth
Provide visual cues that accurately communicate the depth of your content.
Use depth to communicate hierarchy.
In general, avoid adding depth to text.
Make sure depth adds value.
Scale
Consider using fixed scale when you want a virtual object to look exactly like a physical object.
Best practices
Avoid displaying too many windows.
Prioritize standard, indirect gestures.
Rely on the Digital Crown to help people recenter windows in their field of view.
Include enough space around interactive components to make them easy for people to look at.
Let people use your app with minimal or no physical movement.
Use the floor to help you place a large immersive experience.
For the complete guidance, including worked examples and illustrations, see the canonical page: https://developer.apple.com/design/human-interface-guidelines/spatial-layout