Widescreen window layout: newly opened files appear right to different kind of tabs instead of next to other files

(Please see the attached screenshot for a quick overview of the problem)

I try to make reasonable use of a wide screen (2560x1440 pixels) with NetBeans maximized. I moved some parts of the UI (Output, Search Results, Usages) to the right with opened files in the center. While this basically works, all newly opened files open in the right area instead of the center column so I have to move them to the center manually, which is time-consuming and annoying. All files should open in the same area. That way, the other tabs (Output etc.) can be accessed quickly even after opening a lot of files.