There's a handful of additional formats that most users won't need, but might still be useful. Rather than complicate the base installation, these are installable as a separate extension: Vortex Showcase - Extended Formats.
You can install this extension from Vortex just like the main extension, then create a showcase as usual and you will see the additional formats available to select. There's no additional steps to use these formats: just install the extension and create your showcase.