This is asking you to enter the total taxes you paid to Maryland for the same tax year as the refund (this includes withholdings as well as estimated tax and other payments).
You can get this amount from your 2020 Maryland return for the tax year of the refund. Look for a line near the bottom, often bolded, that includes the phrase total payments (for example, "Total payments and refundable credits," "These are your total payments," or similar wording). For Form 502 for 2020, check Line 44.
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