Has LookDev been (re)moved from 2019x. I know that in Unity 2018x there was a LookDev tool on the Window>Experimental>LookDev tab.
I have this question as well.
Found it. Apparently, it will return later this year: https://blogs.unity3d.com/2019/04/16/introducing-unity-2019-1/#lookdev
It seems to be HDRP only now?