Formatting your index attractively can improve readability and help your audience to locate information quickly. The following tips apply to printed indexes.
Fonts Use the same font as the body text, only two points smaller.
For example, if you are using 11 pt. Times New Roman for the body text, print the index using 9 pt. Times New Roman. Indent subentries at 0.2 inches. Subentries wrap at 0.3 inches.