What must you do if you need to add multiple join fields in Alteryx?

Selecting additional fields from a dropdown is the correct approach when you need to add multiple join fields in Alteryx. This method enables you to easily choose and include various fields from the available data without the need for manual input or complex definitions. The user interface is designed to streamline the process of defining joins by offering a clear selection method for the fields you wish to match on, enhancing both usability and efficiency.

This option eliminates the potential for errors that could occur with manual input and allows for quicker adjustments to the join configuration. Utilizing the dropdown ensures that you are working with the right field names and types, which is crucial for ensuring that your data joins are executed correctly.