Mirror
Function Description: The Mirror Vector function allows the user to move a vector object to a new position in a mirror-symmetrical manner.
Steps
1.Click Mirror 
button in the Vector Editor;
2.Move the mouse to the vector and click the left mouse button to determine the reference point for generating the mirror image;
3.Then move the mouse, a mirror preview will be generated at the position where the mouse moves;
4.After confirming the position where the vector will be mirrored, finally click the left mouse button, and the vector object will be mirrored and moved here.
Mirror Vector