Description and start tab
Write a short summary in Add a description…. Start tab chooses which tab opens next time you visit this Doc — Notes, Docs, Tasks, or Media.
Status, tags, and dates
Status options such as Not Started, In Progress, Next, and Complete live here. Date properties drive Scheduled. You can add custom properties with Add and search the list with Search properties.
What Properties is not
Comments and History are separate side panels. Share lives on the More menu, not in Properties.