Yes, it's possible. If you have installed our USB Serial SDK (from this page: https://www.cypress.com/documentation/software-and-drivers/usb-serial-software-development-kit ). And you can set SCB1 as disabled with our USB-Serial Configuration Utility.
I already tried that. It still shows 2 interfaces Vendor 1 and vendor 2.
Please note that the USB-Serial configuration utility uses the other vendor interface to configure the device. In case you do not want to further configure the device, you can disable the 'Enable Manufacturing Interface' option from the utility as shown below.
NOTE: Disabling it will NOT allow further configuration of the device.