Every interface has an expand control in its header. It fills the screen with that one surface: the sidebar, the tab strip, the page header and any neighbouring columns step out of the way.
Why it matters
The workspace shows you a result in context — alongside its siblings and the rest of the run. That is right for reading and wrong for working. A sheet you are actually editing wants the whole screen.
What happens to your work
Nothing. The panel changes position rather than being rebuilt, so scroll position, selection, canvas state and anything mid-edit survive the toggle in both directions.
Using it
Click the expand control, top right of any interface, beside the overflow menu. Click it again, or press Escape, to come back.
What to use it for
- Editing a sheet with more than a handful of columns
- Drawing on a whiteboard
- Stepping through a deck as a deck
- Reading a long document without the surrounding chrome