ASROCK B460 Pro4 - UEFI Advanced Settings; Thunderbolt Configuration

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B460 Pro4
4.6.4 Intel(R) Thunderbolt
Discrete Thunderbolt(TM) Support
Enable or disable the Discrete underbolt(TM) Support.
Thunderbolt Boot Support
Enabled to allow booting from Bootable devices which are present behind
underbolt.
Thunderbolt Usb Support
Enabled to allow booting from Usb devices which are present behind underbolt.
Titan Ridge Workaround for OSUP
Enable or disable Titan Ridge Workaround for OSUP.
Security Level
is item allows you to choose a security level for the underbolt ports.