When the Snap to Line 
option is selected, if the mouse pointer is close to an existing line, any points placed will move on top of the old line, and the new line will snap to the existing one.
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Place points with Snap to Line |
Lines snapped together |
Snap to Line works with Point Draw 
and Bezier Draw 
, and when using Edit Points 
.
Snap to Line allows you to place points so that they align with other objects cleanly and without a gap.
You can use Snap to Line 
when editing. See Snap to Line.
Shortcuts
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Draw Tab, Snap:
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Keys: Alt, D, NL