Which action is NOT possible in the select tool?

The select tool in Alteryx allows users to manipulate and control the fields within their data streams effectively. However, changing field names directly is not a functionality provided by the select tool.

The primary functions of the select tool focus on selecting, renaming, and altering properties of fields, but it does not directly allow for field names to be modified. Instead, a user typically would need to utilize the "Dynamic Rename" tool, which is designed specifically for this purpose, enabling the renaming of fields based on various techniques and rules.

On the other hand, actions such as preventing new fields from being passed through, reordering fields, and changing data sizes are indeed functionalities supported by the select tool. Users can easily choose which fields to include in the output, adjust the order in which fields appear, and modify the data type and size of fields according to their requirements.