Final answer:
Background Export is the InDesign feature that allows users to view the progress of a document's export process while working on another document.
Step-by-step explanation:
The InDesign feature that enables the user to view the progress of a document's export process while working on another document is called Background Export.
Background Export allows you to export a document in the background while continuing to work on other tasks in InDesign. This feature improves productivity by eliminating the need to wait for the export process to complete before resuming work on other documents.
To use Background Export in InDesign, go to File > Export and check the Background Export option before starting the export process.