The undo button is located on the ,home tab on the ribbon, quick access toolbar, vertical scroll bar, status bar

Placeholders  are the containers in  layouts  that hold such content as  text  (including body  text, bulleted lists, and titles),  tables,  charts, smartart graphics, movies, sounds, pictures, and clip art.  slide layouts  also contain the theme (colors, fonts, effects, and the background) of a  slide.

Answerthe user is using an incorrect printer driver;