Answer
Sometimes, it may be desirable to draw and link activities rapidly, without worrying about entering exact dates or fine-tuning them on the canvas. This may be achieved by clicking the GPM/CPM icon in the toolbar. When in CPM Mode, all linked objects are forced to their early-start dates. This means that successors can be drawn as late as desired – once linked to their predecessors, any gap will automatically collapse to zero and pull the activity back. When returning to GPM Mode, all objects will return to their GPM planned-dates.