When I run Project/Profile in Xcode and choose “Zombies“, the app runs in the simulator with “NSZombie detection” enabled. But what should I be looking for to tell me that there is a problem? All I see is the Allocation instrument running and the statistics below. Where will it actually show me that a Zombie was detected?
When I run Project/Profile in Xcode and choose Zombies , the app runs in
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You will get the leak above the object allocation bar.

Check this image;
For a reference, check this video