Here is AMD Guide on Custom Color in Radeon Settings: https://www.amd.com/en/support/kb/faq/dh3-021
It will show you how to configure Custom Colors including Color Temperature Control. According to the FAQ Color Temperature Control should be enabled by default.
NOTE: if Color Temperature Control is disabled and greyed out might indicate that either your GPU card or Monitor doesn't support the feature or you need to enable another setting to get access to Color Temperature Control.
EDIT: I see that your have a RX580 2048SP GPU card. That is a rebranded RX480 (Slight faster) Chinese market only GPU card. Possibly it doesn't have the proper technology to run Custom Color in Radeon Settings.