Ah, thanks. I thought it was your own screenshot, which confused me. The manual has changed in places since the video was made, but YouTube don't let you edit videos without breaking all the old links to them. 
No problem.
I've learnt a bit since I started this thread.
The columns not persisting were really annoying me.
I guess I must have enabled Folder Content Type Detection years ago.
I didn't know that it wasn't on by default. I wouldn't want it turned off though.
If it was turned off, would that mean I'd have the same columns for all folders? For example, music folder columns are completely different to data folder columns.
You can assign different formats to different paths (or path wildcards) whether Content Type Detection is on or off. If you want formats to be applied automatically based on folder contents then you'd need to keep Content Type Detection on, since that's the purpose of it, but it isn't the only way to view different folders with different columns.
That way sounds more cumbersome setting up multiple folders.