Using Xcode 6.1 I opened a panel showing GIT commit notes somehow and now I would like to close it. Does anyone know how???

Using Xcode 6.1 I opened a panel showing GIT commit notes somehow and now I would like to close it. Does anyone know how???

Found it at http://natashatherobot.com/git-blame-view-xcode/ It's called the "blame view" and you close it by clicking on the "One view" editor button at the top of the window (just to the right of the text "Today at 10:18 AM" in the image above.)
On Yosemite, this is what the button should look like:
