AutoCAD Mechanical toolset displays the Feature Control Frame symbols saved in the symbol library.
If you attached the object to an arc, circle, ellipse or spline, skip to the next step.
AutoCAD Mechanical toolset forces the first leader segment to be perpendicular to the attached object and all subsequent sections to be horizontal or vertical. To override this restriction, press the Toggle Symbol Leader Orthogonal Mode key (SHIFT + F, by default) as you drag the crosshairs.
To create the symbol without a leader, specify only the start point and press ENTER.