Today I was trying to figure out how to put a photo back on my iPhone so I could send it to a friend via iMessage. There used to be a photos “tab” in iTunes, but for some reason it wasn’t present so I googled for a solution, and while other users reported similar problems none of the fixes worked. As it happened I expanded the iTunes window horizontally and discovered an interesting UI quirk.
The Photos, iTunes U, Books and On This Phone “tabs” were not shown, but there was no visual indication in the “toolbar” or segmented control that additional selections were available. iTunes also did not show a horizontal scrollbar. You can see the issue in this screen recording showing iTunes with a minimal horizontal width, and then one sufficient to show all items.