It's a matter of the orientation of your Workplane. Since "Workplane by Facet" does not allow you to control its orientation (unless you edit it afterward), "Workplane by 3 Points" is a better choice for dimensioning. First point you click is the origin of the new WP, second point defines the direction of the +X axis, and third point defines the XY Plane. Third point can be anyplace on that plane as long as it doesn't actually coincide with first or second point. Text will be parallel to the X axis by default.