Yes, the form 1099-G has many boxes. The different parts of it are used in different sections of TurboTax. You may not see all the box numbers in TurboTax each time a part of it is used in a section of the return. The federal tax withheld should be for box 4 unless it is a different tax year form or a substitute form that does not match the box #s. If it is a substitute form, but still for 2020, you can enter the federal withholding in the box labeled federal taxes withheld.
Since your 1099-G issued by Maryland only contains boxes 1-5, then it does contain the boxes applicable to reporting state unemployment compensation or a taxable prior year MD refund received.
For example, box 1 and 4 and 10a-11 would be used in the unemployment section of the return.
Boxes 2 and 3 would be used for reporting a taxable MD state refund.
Please review again the box for federal withholding. It should be box 4 unless the tax reporting document is for a different year return or is a substitute form.
Be sure you are using a 2020 tax reporting document for a 2020 tax return.
