First you show the Hole annotation from the Annotate tab, then the Annotation Display icon will allow toggle between display on/off. The icon is located in the Graphics toolbar in Creo Parametric, which itself can be toggled to be included in the Graphics toolbar. Not sure if a config exists to toggle display on by default... See attached pdf file.
The hole notes are not automatically displayed in Creo Paramteric. You can "Show" the notes of any hole feature from theAnnotate tab. Select the annotate tab, select show annotations, select the notes from the dialog box and select any hole feature. The annotations will be placed on the current combination state (controlled by the camera).
Also, reference dimensions can be created as well from the Annotate tab. Use the "annotations" pull donw under on the far right of the tab and the UI to create reference dimensions hasn't changed.