Thank you for your comment.
For example, when drawing a person.
Draw symmetrically using a mirror.
After that, move each part of the figure to change the pose.
I want to correct the face and body after moving it, but it's difficult to correct it because it's already outside the mirror.
For example, if I can select the right and left ears and reset the mirror in the center of them, it will be easier to correct the face.
↓My work sample/