Ti84 Plus "$a+bi$" mode not working

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I just bought a new Ti84 plus when I click on mode and change "Real" to "$a+bi$" it doesn't seem to convert square root of a negative number to the complex form. I have tried it numerous times I have no idea what to do :(

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Why would you want to "convert" the square root of a negative number in terms of $i$ on a calculator? In my honest opinion, calculating the square root of a negative number in your head is better than on a calculator.

For instance, with $\sqrt{-576}$, you can input $\sqrt{576}$ into your calculator, and it will output $24$. You know $\sqrt {-1}$ as $i$, your answer would be $24i$.

I realize this isn't an answer to your question, it is just a recommendation to do a more efficient method.