Is there a shortcut for editing an existing live template in PhpStorm / WebStorm? When I use ⇧+⌘+A (on Mac) and write the name of the live template I get only an option to turn on/off this live template (screenshot) but it would be cool to be navigated from here to the editing window.
No, there isn't, unfortunately. But you can still use ⇧+⌘+A, type the name of LT and you should be able to go just right there from ⇧+⌘+A.