When you create a tag in installation menu, a feature point will be automatically generated. The position of this feature is the psotion of the bottom right coner of the tag at the time you created the tag.



If you move the position of the tag and reset the reference position, it will reset the feature point to the bottom left conner of the tag.



Within the program the tag position is detected using the "find visual offset node".

If you check the position of the tag feature within the program you will see that is remain unmodified.
However, under the "Apply visual offset" node, the feature is offsetted to be at the bottom corner of the tag so that it si possible to make move relative to the detected tag position.