Download and install the Toshiba Function Key Utility (64-bit) and restart your PC. Troubleshooting & Mode Switching
Dynabook (formerly Toshiba Client Solutions) provides the official drivers. toshiba function key utility windows 10 64 bit
: Go to Start > Toshiba > Utilities > Accessibility and ensure the "Fn key" support is checked. Why You Need It Download and install the Toshiba Function Key Utility