If you are running this Converter for the first time, you will be asked to set the default values for file formats you’re converting to. You will not be asked once you set it up. The default value will be used in the next time you convert except MOV format.
When you’re done setting up file formats, you will see that new file names are displayed. The Converter hasn’t converted the files yet.

If you want to change the file settings, you can double click on the file from the list or select the file and click the File menu > Properties.
If you want to delete or add file formats, you can select “Select File Format” from the File menu.