External HDD won’t stop spinning after system being shut down

So i have a Gigabyte Mini PC (GB-BKi3HA-7100) on which i installed Ubuntu desktop. I finally set up the Jellyfin server and all is well, it auto starts and everything. However when i turn off the pc (using normal power down in ubuntu), my external HDD that has al my movies on it, will keep spinning. I don’t like this, I want everything to turn off. I could not find an option in the BIOS.

Any help would be much appreciated!

(here is the manual for the bios: https://download.gigabyte.com/FileList/Manual/brix_manual_bios-quick-guide.pdf?v=8a6f1963f5a4408dd03f744edd9bcae5)