when I mouse mouse the screen enlarge

Mouse Preferences, select what you want your Mouse to do.

You have accidentally activated Zoom!

Go to System Preferences/Universal Access/Seeing to turn it off.

Hi, You can turn off zoom within mouse preferences. What you are doing is double tapping (by accident) with one finger at the top-right hand edge of the mlouse. To undo, double tap with your other finger at the top-left hand corner of the mouse. Well it is a Magic Mouse!