When highlighting text of PDF’s in the PDF viewer I have several times intended to delete a highlighted area. Intuitively I have marked the highlighted text, chosen a right click. This leads me to a pop-up menu with the choice “Remove”. Several times I have selected “Remove” with the intention to remove the highlightning, but have instead found that this selection actually deletes the PDF from the reference. Although I understand that the correct command to delete the highlighted text is “Delete annotation”, I would suggest that the menu selection “Remove” should be replaced by “Remove reference”.