Easy closing calendar, contacts panel on right side of screen (desktop/laptop)
When composing a new message, a panel pops up on the right side of the screen, showing a summary of activity with this contact. The screen also allows you to view other contacts or to look at your calendar.
I am a long-time Yahoo+ customer, and frequently use my Yahoo+ mail in a window that is smaller than full-screen. This allows me easier access to other applications on my computer.
Just show me how to close this panel if I no longer need it.
There is no obvious way to make this panel disappear, and to return the user back to the full window compose mode.

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Kat Sparks commented
Agreed. This is extremely annoying. It should just be a feature... an option you could request in your search criteria, and should be simple to close once you've read it. There is zero benefit to having this remain on the screen.