Final answer:
To find the product category for order 5019-1, unhide the hidden columns in Excel and locate the order to see its associated product category details.
Step-by-step explanation:
The student has asked how to find the product category for a specific order number in an Excel workbook where some columns have been hidden. To unhide the columns, you need to select the columns surrounding the hidden columns, right-click, and choose 'Unhide' from the context menu.
After unhiding the columns, you can search for the order number, which is 5019-1, and look across the row for the information that corresponds to the 'Product Category' column to find the specific product category associated with that order.