To achieve persistent anchoring of 3D models in Vuforia after the image target is recognised, you need to transition from image-based tracking to world-based tracking. The key is to use Vuforia's Anchor system. When your image target is first detected, you can create a new `AnchorBehaviour` at the target's position in the world.

This anchor becomes a fixed point in the real world, calculated by Vuforia's internal understanding of the environment. Your 3D models should then be made children of this anchor object. Once this parent-child relationship is established, the models will remain fixed in the virtual world space, independent of the original image target's visibility. The models will now stay in place as the user moves the device, allowing for free exploration of the environment around the anchored content. This approach effectively decouples the models from the image tracker, using the device's spatial awareness to maintain their position.