Stopped working for me today, on Windows 10. The message window is now positioned towards the top, and is obscuring all messages in chat, while pane is hidden, with F4. I tried looking at Inspect Element to reposition Message Input window, but couldn't figure out a fix.

Updated review:
Reinstalled to take a screenshot of what it looked like my first try, but this time around it looks great. It'll be much easier to participate in class with this, thank you.

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Previous review: I mean... it technically hides the sidebar. It messes everything else up though.

Thanx to the author!
But I still don't understand how the slackchat developers didn't think of it! :)