When you launch MBC4 for the first time, or when you select Code Type... from the Settings menu or New... from the File menu, the Barcode Selector window is displayed.
It is used to determine which of the 200+ bar code styles will be used.
The 'Symbolgies' buttons can be used to select which of the bar code 'families' will be shown in the list.
The Info box gives a brief description of the currently selected bar code type.
The barcode type is selected by highlighting your choice and clicking the "OK" button, or by double-clicking on the selection in the list.
The Cancel button closes the Barcode Selector window leaving the barcode type unchanged.