This tool is available only in Dope Sheet mode, where it is active by default. The alternative Dope Sheet modes are Edit Ranges and Edit Time.
Edit Keys is useful for getting a global view of your animation because it displays animation timing for all tracks. Use this mode for key and range editing when you want to view your changes in the context of the total animation.
Use Edit Keys mode to:
To activate Edit Keys mode, do one of the following:
To delete keys in Edit Keys mode: