Managing placed crop and fold marks

To select a crop or fold mark	Press Option or Alt and click the mark.
To select multiple crop or fold marks	Hold Shift+Option or Shift+Alt and click the marks one at a time.
To delete crop or fold marks	Select the mark (or marks) and press Delete.
To restore a partial set of crop marks to a full set	In the crop mark properties, click the Place crop marks on outside of imposition check box until it is in a cleared state or a selected state with a white background, depending on your requirements.
To delete an entire crop mark set	Select one or more crop marks and press Delete.
To configure default white knockout under marks	In the Preferences dialog box, on the Marks tab, under Other Marks, select the appropriate checkbox: Add white KO under crop marks or Add white KO under fold marks.

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