Dimitry formats his memo so the four heading elements are positioned to the left of the page. This is an example of the design principle of alignment
The principle called alignment in designing refers to the way the elements are arranged relative to each other and to the page. There are different kinds of alignments used such as edge alignment,center, horizontal, vertical alignment and mixed alignment.
In the example given, Dimitry is formatting the memo in which the heading elements are positioned to the left of the page. Hence the design principle used by Dimitry will be the principle of alignment. This helps in creating a balance of elements and helpful of readers.
