I've installed a couple of Input Method Editors (IMEs) while trying to learn some Chinese.
Clicking the shift key on its own normally changes between Chinese input and English / ASCII input.
But once in a while it will switch to ｆｕｌｌｗｉｄｔｈ ｍｏｄｅ for seemingly no reason.
When this happens I can't seem to find a way to switch it back to normal width mode. I would prefer a way to do it from the keyboard, but a way to do it from the system tray would also be worth knowing: