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You asked “Why would a mobility-limited person even think that was how you turn it on?”

They know because they were the ones who asked for it. Just like the first thing a person learning to use computers is what the mouse clics does, the first thing a person with disabilities learn when dealing with computers is what the disabilities functions are, they are widely documented. The very popup that MS shows up has an extensive explanation of what it is and link to disable it immediately.