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They're all separate modes. "Traction" is when you press the Trac button once. "DSC off" is when you hold it for 5 seconds. All others are on the drive mode rocker switch as you already know. It can be confusing at first, I thought the same question myself but they are all separate modes.
See the extra 2 sport columns? Those are just the variations of sport mode built into idrive. You can select chassis or powertrain or both under idrive to tweak sport mode (just sport, doesn't affect sport+ or any others), so those 2 variations are included in that table.
I have my sport mode set as drivetrain only, so when in sport the dampers and steering are soft. This makes a larger gap between sport+ as otherwise they're almost the same. Personal preference
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