1. You told the system that you used your office for part of the year (one day). Depending on the depreciation convention that you used that means you got a month or a quarter of depreciation since you used it for part of that time period. That's where the $14 comes from.
2. The change to personal use happens whenever you tell the system that it happened. If you tell it "December 31 2021" then it should remove everything. If you decide to tell it six months it will take a half year of depreciation but since you have no income you still won't get the home office deduction. The home office deduction doesn't carry forward.
2a. There is no form to tell the IRS you stopped using the home office. Once it's off your return they get it.
3. There is a question in the step by step for entering prior depreciation when you enter a placed-in-service date that is older than the current year.
@micheleaey
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