When you click on the Export button in the Records tab, you will be able to get an overview of all the variables used in your study, including option groups and dependencies. A separate data dictionary will be created for a study, reports and surveys.
When exporting data to Excel format, the data dictionary can be found in one of the tabs in the Excel document:
For the csv export type, the data dictionary will be exported as a separate document:
Learn how to export the data here: Export data