Investors & landlords

The 4562 that prints in portrait format is the one that is actually filed with the tax return, and only if it's required. The ones that print in landscape have the detail you need.

Being that your 2020 taxes were done by someone else, the worksheet they used for the detail you need may be different. But basically, it looks like the one below.

I don't recall TTX2021 asking me anything at all about prior year's depreciation already taken

Assuming you entered everything correctly, especially the in-service date, the program will pre-fill in an assumed amount, and the box is editable so you can change/correct it if necessary.