If your mouse does not work correctly on Remote Desktop or the cursor disappears, ensure your mouse is working physically and use these fixes.

Quick Tip: To fix a Bluetooth mouse that’s not working, save all work then press and hold the power button for 10 seconds to turn off the computer, then unplug the mouse (or remove its batteries ...

To fix Magic Mouse tracking problems, reseat the battery, recharge the built-in battery, and clean the optical sensor. You can also try adjusting the mouse sensitivity.