I’m hoping this pop quiz is a little more challenging.

Below is a picture of the right portion of the File Tab Channel.  I’ve circled the drop down button that drops down the list of open files.

file tab channel drop down control

Now, under what condition does the icon change to having a bar over the top as shown in the below image?

file tab channel drop down control with a line over it

My adopted MVP Peter Ritchie says leaving answers as comments is fine with him, so it is fine with me =)

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