Deductions & credits

If you have no expenses that are office only, leave it blank. You selected to enter actual expenses. The third screen says do not enter expenses already entered. This is only for expenses that are only for the home office. You may have a separate utility meter running to the office or may have a separate structure, losses, repairs that did not apply to the whole house.

The next screen looks scary with a bunch of zeroes for the home office and your actual numbers for the whole house.  If you take a look at your Form 8829 OIH, you will see the expenses are correctly allocated.