Cannot disable Spaces? Am I crazy???

If I hit Cntrl-Left or Cntrl-Right arrow, my desktop changes background, which I think is a throwback to when I had multiple monitors (on NVIDIA).

Now I have a single 4K monitor on AMD, I can still change "spaces" using the keyboard command, although they are completely disabled (from what I can tell).

Anyone got any ideas how I would fix this (not urgent).?

submitted by /u/themacmeister
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