What is required for a user to customize the data shown in the worksheet effectively?

To customize the data shown in a worksheet effectively, a user needs to have a user-defined variable in the query expression. This requirement is essential because user-defined variables allow customization of data retrieval and presentation based on specific criteria or conditions set by the user. By defining variables, users can tailor the data queries to meet their needs, resulting in a more relevant and personalized view of the information within the worksheet.

Utilizing user-defined variables enhances the flexibility and power of data manipulation. This customization is crucial for users who need to analyze or present data that is not fixed and may vary based on their specific analytical requirements. In contrast, options like complex coding knowledge or predefined data structures would complicate the process for users who may not have advanced technical skills. Additionally, while approval from the workbook administrator could be relevant in some contexts, it does not directly facilitate the customization of data representation within the worksheet itself. Therefore, having user-defined variables is the most effective means of achieving tailored data displays.