The 'Method' column contains a list of methods in the stack trace of the thread that caused your program to crash. Depending on the platform you may see methods that don't match your source code. This is because platforms such as Windows Native, .NET Framework, Crashpad, Breakpad, OS X, Unity Native and Unreal require you to upload symbols for each version you release in order to calculate the correct method names. For more information on how to upload symbols please see the documentation for your platform.
Clicking the > (greater than symbol) in the left-most column will expand the Row Details view.
The Row Details view will display the Group Stacks button that will allow you to create a subkey. Grouping at a different level of the call stack is called subkeying and is useful in cases such as a crash that occurs in a 3rd party library, or when additional stack frames are added by a crash reporter.