Can Ezcad control mark from left to right and from top to bottom like a printer? According to the object list, from top to bottom is the marking order. But laser marking is found jumping around which affects the efficiency of marking. Is there any way to improve it?
Yes, check the All Calc:
Menu – Edit – Hatch (Ctrl+H) – Check All calc.

Calculate all the selected objects as a whole. This is an optimizing option. In some cases the speed of marking may highly be raised. It will take long time to calculate large, complex objects. When not selected, the objects will be calculated separately.