The Developer options on the Samsung Galaxy S7 are not enabled in Android marshmallow by factory, which means that you have to activate this option group first. If you do not know how to activate the developer mode on the Samsung Galaxy S7, then we would like explain that here more precisely:
From the home screen of the Samsung Galaxy S7 navigate to:
Menu --> Settings --> device information
In this Android Marshmallow submenu you can now see various information about your Samsung Galaxy S7. In order to enable the developer options, tap several times in rapid succession on the "build number" entry.
After about the seventh time tap, a message appears with "developer options enabled". The just unlocked developer options are now also findable in the settings. They can now be opened and activated via the controller.
You have just learned how you can activate the developer options on the new Samsung Galaxy S7 within Android Marshmallow.