A mouse with a trail is an accessibility feature known as a pointer trail which makes it easier to see the mouse pointer and track its movement. It is especially helpful to users who have impaired vision or very small computer monitors.
How do I turn off cursor tails?
In the Mouse Properties window, switch to the Pointer Options tab. Check or uncheck the Display pointer trails box to enable or disable mouse pointer trails. Use the slider to adjust the length of mouse pointer trails. Click Apply followed by OK.
Why do pointer trails exist?
The pointer trail is no longer necessary for modern active-matrix LCD screens, but the feature has proven useful for accessibility. It helps people with visual difficulties to spot where the pointer is on a large screen by emphasizing its movement and leading you to its current position.
How do I put a tail on my cursor?
To enable mouse trails
Select Mouse in the left column. Under Related settings in the right column, click Additional mouse options. In the Mouse Properties window that appears select the Pointer Options tab. In the Visibility section check the box labelled Display pointer trails.