Now, it uses alt+F4 to close editor. However, alt+F4 is usually used to close the whole program. I suggest fast key for closing editor should be customized or use Ctrl+W
You can easily close the editor using the ESC-key, which will also do an auto-save of your notes.
Thomas is right - you can just use ESC
While you can use ESC, CTRL+W is standard Windows behavior so should be supported as well. This would make it more consistent with other Windows apps
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