I accidentally hit some hotkey and lost the right most section of the default display. That section normally has the Outliner window above the Properties window. So I went to find out how to restore it from the Blender 2.79 Reference Manual. However, searches kept bringing up the Blender 2.80 Reference Manual. I found a place I could download a .zip of a .pdf of the 2.79 manual, but only after I registered.
I believe that are many of us, who for various reasons, don’t want to update to 2.8x yet. It’s hard for me to understand why a pre-2.8x manual is not available. If you know where a 2.79 manual can be downloaded (without registration), please let me know. Barring that, is there a hotkey that can restore the rightmost section. Note, this is not the Properties panel toggled by [N].
You probably accidentally hit ctrl + up arrow and maximized the 3D View. That’d be ctrl + space in 2.8. If that’s not it, you can click on the corner of the 3D view and drag with your mouse to open a new Editor - then switch it’s type to “Properties” (not the “N panel”). Do the same thing again vertically to open the outliner.
@Stuntkoala, thank you for your helpful response. I have bookmarked the 2.79 manual. Relative to the issue with the rightmost section disappearing, I was able to reproduce the crime using Ctrl-[UpArrow] as you suggest. Surprisingly, I was not able to restore the rightmost section like you show in your 2.8x video. For 2.79, when the display is in the default state, there is a widget in the upper right corner of the main window that you can drag out to add new windows, as you show. However, when in the Ctrl-[UpArrow] state, the widget is not there and dragging on the right edge does nothing. I believe that is because, in 2.79, the Ctrl-[UpArrow] state is temporary and there is a section in the main header at the top [< Back to Previous]. I didn’t see that before I made my initial post. So, for 2.79, the default state can be re-enabled by either pressing Ctrl-[DownArrow] or clicking the [< Back to Previous].
Relative to 2.8x, I’m using Blender for my work. The present addons and preferences are exactly what I need for the current project. When this project is over, I will certainly consider 2.8x.