Use to toggle between using only the Main UI shortcut keys or all shortcut keys together.
When the Override toggle is off, only the Main UI shortcuts are recognized. When Override is on, both Main UI and functional area shortcuts are recognized. If there is a conflict between a shortcut assigned to a feature and one assigned to the Main UI, when Override is on, the shortcut for the feature takes precedence.
You can customize keyboard shortcuts using the Hotkey editor. The list shows which shortcuts have been assigned to which command or feature.