Which design element involves the act of lining up objects vertically or horizontally to give a sense of order?

The answer is "Alignment".

Explanation:

The Alignment was its positioning of visual elements, such that they're coordinate together with such a structure. This is a layout concept that refers to words or pictures lining up with one page. They use coordination in the layout to coordinate entities, a system similar, equilibrium, framework formation, the connection among aspects, and clear and clear result.