The following options are available on the Image Target object:
Data Set: A drop-down list of available data sets, defined by the sets located in the StreamingAssets\QCAR folder.
Image Target: A drop-down list of available Image Targets, defined in the Dataset Configuration XML file in the StreamingAssets\QCAR folder.
Preserve child size: If checked, any children of this target maintain their size when the target is changed. If unchecked, the child objects will resize to match the new target scale.
Basically the child will retain its scale despite changes in the parent's coordinate space.
This is addressed under SDK > Mastering Advanced Topics > Special Options
https://ar.qualcomm.at/qdevnet/sdk/android/Special%20Options%20-%20Android
Image Target Object Options
The following options are available on the Image Target object:
Data Set: A drop-down list of available data sets, defined by the sets located in the
StreamingAssets\QCARfolder.Image Target: A drop-down list of available Image Targets, defined in the Dataset Configuration XML file in the StreamingAssets\QCAR folder.
Preserve child size: If checked, any children of this target maintain their size when the target is changed. If unchecked, the child objects will resize to match the new target scale.
Basically the child will retain its scale despite changes in the parent's coordinate space.