As far as I know I do have only one (1) Desktop enabled
I'm looking at this web page right now in Safari.
Safari is a normal window (say, 50% of the width and height of the physical screen, and it is sitting right in the middle of the physical screen).
This is a mid 2015 mbp with no external monitors attached. Every piece of software is the latest as of writing
Using the pointer, I grab an image (say, one of the small icons on this screen).
I grag it to the extreme right of the desktop - as if I am going to drop it on the desktop near the right
But I keep dragging it, and hold it on the extreme right edge of the screen
IN FACT WHAT HAPPENS IS......
After a few moments, the "whole desktop" will slide to a new desktop on the "right".
Strangely, this new desktop has a different color background to my usual desktop
The "new" Desktop appears to be identical to my usual only desktop (same icons scattered around etc), except only the background color is different
And click here for a video !!!
I want to completely disable this "sliding" function. (Or at least know what the hell it is!!) Is it possible?