The relate point markers (+) are visible on the group you are currently scrolling on the viewbox.
Click the relate point marker (+) and drag the marker to a different location
Or
Activate Relate 
mode and click the new region of interest to create a new relate point.
A relate point is determined according to a calculation of slice spacing and slice thickness. There is a tolerance, or percentage, for the calculation. The relate point marker is visible when the point is within the tolerance. The relate point marker changes color when the point is within the tolerance but is an inexact match.
You can show or hide the relate point markers.
To hide the markers: press ALT + G on the keyboard.
To view the hidden markers: press ALT + G again.
You can delete a relate point markers from all groups in the same way as you delete other measurements or annotations. See Deleting Measurements or Annotations.
NOTE: The preferred practice is to hide relate point markers instead of deleting the markers.
See these topics: