One way it could do this is if the software had savable sessions and tabs, and each tab could have its own text pane. Or maybe the window would just have six panes, where the software has no tab feature. Either works. I don't mind if I have to get plugins for a software in order to do this.
I prefer something simple and accessible, which can open and close new and old files with minimal steps, easily enough that you don't have to think too hard about it, like the basic Windows Notepad program.
I tried Notepad++; it only offers the ability to have two 'views' at the same time, which is not enough for me. If there is a new plugin which could accommodate my needs though, I welcome the recommendation; still have npp installed.
Recommendations which are not Emacs or Vim are preferred