What is the primary use of the Trim command in a sketch?

The primary use of the Trim command in a sketch is to remove unnecessary sketch lines. This command is specifically designed to help in refining a sketch by cutting away parts of lines, arcs, or other sketch entities that are not needed or that interfere with the design intent. It allows for a cleaner and more efficient sketch, making it easier to focus on the relevant geometry that will be used for further development in the design process.

In the context of sketching, having unnecessary lines can lead to confusion or complications when applying constraints or features to a design. The Trim command helps simplify the sketching process by allowing the user to quickly eliminate these unwanted elements, thus streamlining the workflow.

The other options do not directly relate to the core function of the Trim command. Changing colors of lines pertains to aesthetics and does not involve alteration of the geometry itself. Enhancing dimensions is more associated with dimensioning tools rather than trimming or cutting elements of a sketch. Adding new features to a sketch refers to commands that create additional geometry rather than the removal process that the Trim command facilitates.