To AutoFit the width of column?

The correct answer is Double-click the right border of the column header (truncated as Double click in the original dataset).

In spreadsheet design and data literacy pedagogy, mastering workspace optimization techniques is vital for maintaining clear data visibility. Excel's AutoFit feature automatically resizes a column's width to precisely match its longest text string or numerical value, preventing truncations or "###" overflow errors. To trigger this behavior with a mouse shortcut, the cursor must be placed on the boundary line dividing the target column header from the column directly to its right. Double-clicking this specific intersection commands the software to evaluate all populated cells in that single column and adjust the boundary instantly.

The alternative distractor configurations present severe text truncations and inaccurate operational steps. For example, double-clicking the left border of a column header would inadvertently AutoFit the *preceding* column, not the active one. Simply clicking the center of the column header merely selects the entire vertical layout, without initiating any resizing calculations. In an optimized software assessment, providing fully descriptive operational pathways ensures that student metrics accurately evaluate practical interface proficiency rather than guesswork.