This section takes you step-by-step through slowing down your mouse pointer or cursor in Windows 10, complete with pictures of the screens to help you.
1. Open the Settings window by pressing the Windows key, + I on the keyboard. Alternatively, click the Start button then Settings. In the Settings window, click Devices.
2. On the Devices screen, scroll down and select Mouse from the list on the left.
3. Go to the right-hand panel and adjust the slider labelled Cursor speed. Moving it left will slow the cursor down, while moving it right will speed it up. Adjust it, moving your mouse between adjustments, until you find the right speed for you.