The most fundamental action on the Group Crashes page is Group Similar Crashes. This action will group all crashes that match each of the displayed stack frames at the top of the stack. This means that crashes with RaiseException, _CxxThrowException, and FileSystemUtils::Save at the top of the stack will be grouped by FileSystemUtils::Save. However, crashes with RaiseException, _CxxThrowException, SomeOtherFunction at the top of the stack will still be grouped by KernelBase!RaiseException.