JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. (Technology Preview) To Apply a Horizontal 2D Constraint Select the Horizontal 2D Constraint tool ( Drawing > Constraints > 2D ). Select the element or segment you wish to change. The selected entity or segment is now set to the direction of the x-axis of ACS Triad. Parent topic: (Technology Preview) Horizontal 2D Constraint