CSM for the Asrock N100DC-ITX

Hi,
can somebody enable CSM for my Asrock N100DC-ITX?
The CSM core is in Bios, but complete hidden.
I think, that this comes together, that there is no switch in Bios to disable the internal graphik in cpu.
I use an external graphik card Geforce GT 730, that shows me the Bios.
Thanks for help!

My Bios from Asrock Website N100DC-ITX_1.06.ROM

https://ufile.io/sg60zwj6