The work related expense deduction for W-2 employees has been suspended starting with tax year 2018, through tax year 2026 (unless congress extends it.) Period.
There are two questions in the program that I don't know exactly how they're worded, so I'll paraphrase as best I can.
Percetage of business conducted in the home office - This will commonly be less than 100%.
Percentage of time the space is used exclusively for business use in a business that you own - This must be 100%. Anything less, and you do not qualify for the home office deduction. Period. Now you may only be in that space for 1 hour a week. But if for that one hour you are conducting business for a business that you own, it's 100% business use. So if the kids use that space for doing their homework, playing games, etc., or you also use that space for watching football games on TV, it's not 100% business use.
Since you've clearly stated you use the space for things other than the business that you own, you do not qualify for the home office deduction.
