A near menu is a collection of buttons on a panel that follow your users with tag-along behavior. The panel stays within a set distance range and angle, which lets users comfortably interact with content. If you need to world-lock or disable the panel's tag-along behavior, use the pin button or grab and place the menu. Pinning the panel lets your users focus on the target content without any distractions. You can re-enable the tag-along behavior at any time by pressing the pin button to make the menu follow the user again.
Near menu in MRTK (Mixed Reality Toolkit) for Unity
MRTK provides various near menu prefab examples.