In the web app: To manage data fields from the task pane, select any shape, then select Data in the task pane. Select Add and Arrange Data Fields, then drag the data fields to remove or move them. You can also add new fields and groups.
If a data field is in the project, but it is not displayed in the task pane, you can add it.
If the data field does not exist, you can create it.
You can arrange the data fields to appear as you want in the task pane.