You should actually do this every year. Even more often is recommended by Carol Fell (the website computer guru) if you spend a lot of time on the computer.
I was shocked to see how well this works, and how far off mine was!
To re-calibrate your mouse, click and hold on the H below, then drag the H toward the d.
If it doesn't work immediately, you might want to clean your mouse, as the calibration is off.
Have a good New year --- and don't believe every word you read
Thanks for this one from D&A's Jean Campbell with a little modification from Carol