See here: Ability to fine-tune colour settings, especially @Philips_Support_P’s post here: Ability to fine-tune colour settings
That color management app hasn’t been publicly released yet. Maybe they gave up on it? He already mentioned on January 16: “An app to fine-tune the colour is being released to beta testers and will soon be available […]”, too.
I’m really not sure why this doesn’t seem to be a priority anymore (and doesn’t seem to actually ever have been released) as these are main basic settings and users should easily be able to tweak them if they want to.
In any case, I’ve been eagerly waiting for it since then and always been disappointed when it once again didn’t show up in the new FW’s changelogs.