I honestly feel stupid asking this question, but here it goes:
I cannot find a way to locate in which folder/app_group I misplaced an app icon.
If I use the search in the app drawer (go-Launcher Z or default home screen app (TouchWiz home), I can easily find the app icon, but it will not let me know in which folder/app_group the icon is.
On IOS you can achieve this very easily: If you searched for an app, you will see an app icon—which you can tap to launch the program—as well as a header that tells you in which folder the app is stored.
This is a search example (for the Netflix icon/app):
You can see that the icon is located in the media folder. In this case it is easy to find, but when a folder holds more than 4 icons locating an icon is tedious.
GALAXY S6 Android 7.0