Translations:Sketcher ConstrainHorizontal/11/en

From FreeCAD Documentation

Apply the Horizontal Constraint by clicking on the Constraint horizontal in the Sketcher Constraints toolbar or by selecting the Constrain horizontally menu item in the Sketcher constraints sub menu of the Sketch menu item in the Sketcher work bench (or the Part Design menu item of the Part Design work bench). The selected line is constrained to be parallel to the horizontal axis of the sketch.