With the Export Batch window opened, you can drag and drop the project icons from the Project Manager; or you can drag and drop the project files from Windows Explore window.

The Batch will automatically select an output file name for each project.

You may change the output file name by selecting the item and clicking the right mouse button, as shown below.

You can also change the file path for two or more projects.

Finally, press the button to start all the selected export jobs in the batch list; or the button to start the export job for one single project.