Does it make a difference if I file as single vs Head of household? It went to single and is not giving me the option to change it. Thanks

Yes, usually filing Head of Household is more advantageous if you are eligible to file that way. 

HERE is a link describing the requirements to file Head Of Household. 

Head of Household filing status is not just that you maintain a home.  But for HOH you must have a qualifying person as a dependent on your tax return.

HOH provides a higher standard deduction then filing as Single.