To help avoid constraints to external objects, what selection scope can be used while working in a sketch?

The selection scope "Within active sketch only" is designed to limit the constraints and selections to elements that are part of the sketch you are currently working on. This ensures that you are not inadvertently selecting external objects or entities that could lead to unwanted constraints outside of your intended sketch. By using this selection scope, you can focus solely on the elements that directly affect the current sketch, which allows for greater control and minimizes the risk of introducing dependencies that could complicate your design later. This is particularly useful when you want to isolate your sketching work from other parts of the model or assembly that may be present in the workspace.

The other options, while they specify different scopes, do not provide the same level of control. For example, selecting "Within work part only" may include external objects within the same part but not specifically limit you to only the sketch, and "Entire assembly" would expose you to all components in the assembly, greatly increasing the chance of inadvertently adding constraints to unrelated parts. "Within Design group only" might also imply a broader selection that includes various elements outside the active sketch. Thus, the scope of "Within active sketch only" is the most effective choice for focusing on the specifics of your current sketch task.