This conversation has been merged. Please reference the main conversation: Lightroom mobile: Histogram not displayed in rate mote (star)
I went into the "three dots" menu > View Options, and Show/Hide Histogram is greyed out, no matter what I do. Show/Hide Info has the blue vertical bar next to it; if I turn off Show Info Overlays, it turns back on when I tap it or when I tap Show/Hide Info, but Show/Hide Histogram is always greyed out.
Everything works as expected on my iPhone XS - two-finger tap brings up image info, then histogram, then turns them off, etc. The problem seems to only be on my iPad Pro. This is with the latest version of Lightroom CC and iOS 12.1.3.