Part Modeling > Modifying the Part > Dynamic Edit > Locked Dimensions and Locked Entities in Dynamic Editing
  
Locked Dimensions and Locked Entities in Dynamic Editing
You can lock and unlock selected Sketcher dimensions when you are using the Edit command and when you are working in Sketcher. Entities that are locked within Edit are also locked in Sketcher and vice versa. Locked sketch dimensions and entities are modified by typing new dimension values. Locked sketch dimensions and entities cannot be modified by dragging sketch entities