There are several functions where Opus automatically formats text for you because it indicates a particular type of text. These are presented in the Text Effect Styles section of the Text tab of a Text object’s Properties dialog.

the text style used to show a piece of text is a hypertext link.

the text style used to indicate that the mouse is over a piece of hypertext.

the text style used when a piece of hypertext is clicked on to show the user that their action has been registered.