I don't understand the wording: The info bubble implies that I enter the difference I deducted (I didn't deduct). What do I put here, simply the $ I contributed in 2023?

Could you provide some more context? For example, the wording of the statement you are referring to, the heading at the top of the screen, or even the path you took to get here.

You started with Deductions & Credits, then where did you go (Retirement and Investments, I suppose), then where?