FIDO disable response

Is there a way to disable U2F/FIDO2 interface on the OnlyKey as there is for Yubikey?

I have no FIDO credentials, resident or non-resident, yet one of my OnlyKeys flashes upon FIDO challenge. This occurs regardless of browser or device.

Curiously, my other OnlyKey with different credentials/different backup phrase and again no FIDO credentials, appropriately does not respond to FIDO challenges.

Both OnlyKeys have same latest firmware.

Thanks