Sabes dónde está todo.

English Translation

You know where everything is.

Since it’s not a question, why is the accent on the ‘o’ in dónde? ChatGPT says something about ‘indirect questions’, which I guess I could kind of see given the context of situation?

Indirect questions, like this one, are indeed sometimes hard to spot. But with practice you will eventually learn to spot them easily. And, remember that the accent isn’t just cosmetic, it indicates that the word carries more stress than the unaccented version.