Unanchoring boxes and lines
To unanchor an item, select it with the Item tool and choose Item > Duplicate to create an unanchored copy of the item — the duplicated item will be placed on the page according to the settings in the Step & Repeat dialog box (Item menu). Then delete the anchored item from the text by selecting it with the Text Content tool 
and pressing Delete/Backspace.
Parent topic: Using anchored boxes