Timeline was added in the Windows 10 April 2018 Update. It’s an extension of Task View, and allows you to see what you were working on yesterday, or up to 30 days ago, and very quickly load that document, image or website.
There are a few limitations, but on the whole it’s well worth using this useful new tool.
Where can I find Timeline?
Apparently, very few people use the Task View feature that was introduced when Windows 10 first came out.