Extended Desktop management

I have a dummy plug installed, and I have it "placed" in my displays CP in the upper-right corner of my primary display.  However, I still lose my cursor when I'm going up into that corner.  Is there a way to disable that feature?

For context, I have the dummy plug for when I am remote and want to turn on my workstation but not the monitor (and the remote client works a LOT better with a "connected" display to engage the GPU).  My primary monitor is a curved 16:10, and the dummy won't support that, so I can't mirror displays, and I would rather not plug in the dummy when I know I'm going away