What do I do for "Itemized deductions-Reduction to State Income Tax"? It says Delaware allows a deduction for state income taxes but what does this mean?

It says that I can enter the portion of your out of state tax credit that was paid during 2022 but what does that mean? I work in MD and live in DE. It gives me an "out of state tax credit" amount and then asks me to enter the portion of that amount that was paid during 2022? What does that mean?