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When I take my mouse out of the library pane the screen goes darker and the selected images are left bright. I’m not sure what button I pressed to cause this. How can this be toggled off?
I thought I was typing a key word tag when the action was invoked on a particular key stroke.
You may have hit the L key, which invokes "lights-out" mode, darkening the UI but leaving the image bright. Pressing L repeatedly will cycle between normal, dim, and dark modes.
The F key you noted cycles between windowed and full-screen modes.
