Comment 3 for bug 1790352

By middle button, did you mean the "scrolling wheel" of the mouse? It does work on my machine. I've looked at the code, the option is there; it should work.

I'd say you consult in the community website first; after hearing what folks there have to say, if it's necessary, open an issue on the GitHub repo of Caja: https://github.com/mate-desktop/caja