You are correct that the Home Office Deduction has not changed in 2018 for self-employed persons.
If your business had a profit, and you indicated that you do '100% of your business from your home office' you should get the home office deduction.
There are several other screens prior to this one that could also affect your Home Office Deduction.
Type 'home office' in the Search window, and then 'Jump to Home Office' to EDIT your home office.
Go through the Home Office section and re-check your entries.
Here's some info to help you:
https://ttlc.intuit.com/replies/6009044
Edited 2/13/19 3:53 PM
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