You have to be consistent for Maryland (itemized both Federal and State) or (standard deduction for both).
"The federal tax reform of 2017 significantly raised the federal
standard deduction. Under current Maryland law, if you take the
standard deduction the federal level, you cannot itemize at the Maryland
level. You may take the federal standard deduction, while this may
reduce your federal tax liability, it may result in an increase to your
Maryland income tax liability. The Comptroller’s Office encourages you
to run your income tax returns under both deduction methods, and to
compare the results of taking the standard deduction versus itemizing
yours deductions, to see which method causes the lowest overall tax
liability."
paragraph above from the State of Maryland web site. https://taxes.marylandtaxes.gov/Individual_Taxes/General_Information/What_s_New_for_the_Tax_Filing_S...
