Where this is actually useful
A shadow works best on cover pages, posters, and flyers, where a text box needs to visually stand out from a busy background rather than blend into a plain page of body text.
Combine it with other shape effects sparingly
Shape Effects also offers glow, reflection, and bevel. Stacking more than one or two effects on a single text box tends to look cluttered rather than polished, so a single well-chosen shadow style usually reads better than combining several at once.
Frequently Asked Questions
Can I apply a shadow to regular body text without a text box?
Not through Shape Effects, since that only applies to shapes and text boxes. A similar, though more limited, text shadow exists under Text Effects for ordinary text, accessible from the font options on the Home tab.
Will the shadow show up when I export to PDF?
Yes, shadow effects are preserved when a Word document with a shadowed text box is exported or printed to PDF.