From FreeCAD Documentation
- Select one or more constraints.
- There are several ways to invoke the tool:
- Press the Select associated geometry button.
- Select the Sketch → Sketcher visual → Select associated geometry option from the menu.
- introduced in version 1.0: Right-click in the 3D view and select the Select associated geometry option from the context menu.
- Right-click in the Constraints section of the Sketcher Dialog and select the Select Elements option from the context menu.
- Use the keyboard shortcut: Z then E.
- The associated sketch elements are selected.
- Optionally click in an empty area in the 3D view to clear the selection.