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 | Automatic relations | 
This mode allows the automatic creation of relations between the sketch entities to be enabled or disabled.
Use:
Click the  icon or select the 2D sketch or 3D sketch > Modes > Automatic relations command from the drop-down menu. In a draft document, use the Sketch > Modes > Automatic relations command.
 icon or select the 2D sketch or 3D sketch > Modes > Automatic relations command from the drop-down menu. In a draft document, use the Sketch > Modes > Automatic relations command.
When this mode is enabled, the relations (alignment, horizontal, vertical, tangency, coincidence, etc..) are created automatically.
When this mode is disabled, the relations are not created.
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 | Activation of this mode may over-constrain the sketch. In this case, the relations of no use must be deleted manually. | 
Additional information:
This mode is enabled when the icon is pressed (the background remains colored).