I am using notepad ++ as my IDE. And I encounter a problem when I use the function list box.
Usually I would put a list of functions on the right side, the project explorer window is on the left side. If I put the function list window on the left side, it will merge into one window with several tags. It is not very convenient when I code.
Recently, I click the wrong button in the function list window, and it left the right side and became a separate window.
I am trying to reconnect it to the right side, but the upper area occupies the upper window.
So now I can leave it in a separate window form next to the right side. It still works, but it is connected ..... I do not know how to return it in the right direction. 
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