Hello.
In the adjustments studio i find the curves-adjustment under the sub-category "adjustments". But there is also a sub-category "curves" that is empty. It is the same for "Channel Mixer", "Color Balance", "Invert", "Lens Filter", "OCIO", "Selective Color" and "Split Toning". Of course, this is a little bit irritating.
By the way: A category for favorites would be handy. ;)
Best regards
Dexterward