On Xcode 9.1 the Pixel Accurate option is disabled and grayed out under the Window menu.
Pixel Accurate
Window
How can I take App Store screenshots without this
You could set the simulator to landscape mode by clicking ⌘ + → first, then you could click ⌘ + 2 to select Pixel Accurate option, don't forget set simulator to portrait mode by clicking ⌘ + ← :)
⌘
→
2
←