So, we have had tons of issues with that HOH box.  Let me share with you some of our 'tricks':

When you enter a new employee and get to the pay period cycle, use the pull down menu and click on the correct pay period (weekly, biweekly, etc) but DO NOT ENTER OR TAB to the "Maritul Status" field. Instead, use your mouse and click on the "W-4" tab.  Then when you are at this screen you can choose any filing status you want.  When you are finished there, go back to the Main screen and that's where you have to enter the number of exemptions.  (Of course, because the system won't let you out of that screen without it.)  We always enter "0" for federal on all employees with 2020 or newer W4s.  

Now, let me just say however, we have yet to get the correct federal withholding on anyone whom we use the HOH filing status for.  You cannot even view any HOH tax tables from the system utility menu - with the exception being the HOH with second job box checked status.  I have posted questions on this forum, spoke at length with customer service, uninstalled and reinstalled, installed on new computers, etc and it still won't withhold any federal taxes with HOH status.  So, if you have any knowledge on how those tables work, or how you can even view the HOH tax tables in the system utilities menu I'd love to know!  We were told that the IRS told Intuit they had to set it up that way.. whatever that means, I have no clue! 😞