'Zoom' - opens dialog of zoom setup. Zoom can be selected by 'JoyRight' and 'JoyLeft'. Grid in middle of window shows to you how big will be points on screen when you set this zoom. Keys '1'-'9' allows you to select zoom from 1 to 9. Max zoom is 50. REMEMBER when you set zoom near to x1 (it is from 2 to 5) - picture can be drawed slow on screen in editor when you move cursor (especially if 'Shape images' enabled too).