What is indicated by a red box with a plus sign in InDesign?

• A. Overset Text.
• B. A locked object.
• C. An empty text frame.
• D. A visible grid.

Answer: (A)

A red box with a plus sign on a text frame means there is overset text—more content than the frame can display. This signals you need to enlarge the frame, thread the text into another connected frame, or edit the text to reduce its length. Once you adjust, the red plus goes away.