<p>Once you selected the item you want to change the key binding for, you should click the <em>Change</em> button below, and the press the key binding you want, then validate the dialog.<br>
Alternatively you can indeed manually edit the keybinding field in the list, but you then need to enter a valid description string, including the modifiers you want.  In your example, it would be <code><Primary>e</code>.  But I highly recommend using the change dialog as it will capture the keybinding automatically, as needed.</p>

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