Go to System Settings > Bluetooth , turn Bluetooth off for 10 seconds, and then turn it back on.
Ensure your mouse has at least a 20% charge ; low battery can sometimes cause secondary features like scrolling to disable to save power. System Configuration Check magic mouse not scrolling
Flip your mouse over and use the small switch to turn it off. Wait about 10 seconds, then flip it back on. Go to System Settings > Bluetooth , turn
: Toggle Bluetooth off and on in your Mac's menu bar. If needed, "forget" the mouse in Bluetooth settings and repair it as a new device. Surface Cleaning Go to System Settings > Bluetooth