atom-editor

On Windows and Linux: Ctrl + K then Ctrl + U for uppercase Ctrl + K then Ctrl + L for lowercase On Mac: Cmd + K then Cmd + U for uppercase Cmd + K then Cmd + L for lowercase

I had the same issue and atom-goto-definition (package name goto-definition) worked like charm for me. Please try once. You can download directly from Atom. This package is DEPRECATED. Please check it in Github.

According to this, cmd + / should do it. And for Windows and Linux, it is ctrl + /.