Hi, I am a Masters of Nursing student. I have written many a papers in APA format and could set a document in my sleep. Show the top or side rulers to measure and align objects in your documents. The horizontal ruler appears just beneath the Ribbon and is used to set margins and tab stops. The vertical ruler appears on the left edge of the. Word window.
 
 

MS Word Ruler and Margins not setting correctly – Microsoft Community

 
Turn on the ruler. If you don’t see the ruler at the top of your document, go to View > Ruler to display it. The ruler setting on the View tab. Set the margin unit of measurement to inches, centimeters, millimeters, points, or picas. Note: This change also affects the ruler and other measurements.

 

Microsoft word 2013 margin ruler free download

 
Resolved my issue.