Can dimensions be added after the number next to the cursor shows the size of a sketch element?

The assertion that dimensions cannot be added once the size of a sketch element is displayed next to the cursor is based on the understanding of how SolidWorks manages dimensions in the sketch environment. When you see a dimension next to the cursor indicating the size of a sketch element, this dimension is a dynamic indication of the size based on the current constraints and relations in place.

The dimension presented is effectively a visual feedback mechanism to show the current state of the element, and adding another dimension that duplicates this information would indeed be redundant. Since the system already provides this critical information dynamically, introducing an additional dimension would not provide new insights or specifications but merely clutter the sketch with unnecessary details.

Among the alternatives, it is important to recognize that options suggesting further dimensions or edits after the size is indicated fail to account for this functionality in SolidWorks, where clarity and efficiency are prioritized in the design process. Therefore, saying that the dimension is redundant correctly captures the nature of dimensions in sketches, emphasizing that you can rely on the system's dynamic display without needing additional, unnecessary dimensions.