EmEditor Tray Icon’s menu opens when a user presses CTRL + ALT + N. To disable this behavior, you can right-click on the Tray Icon, select Customize, and then clear the “Shortcut Key to Simulate Left Mouse Button” text box.
I apologize for any inconveniences this might have caused you even though you shouldn’t see the menu if you press only an N key (without CTRL or ALT).
Please don’t hesitate to ask me if you have further questions. Thank you.