Documents panel

The Documents panel (left sidebar) lists the documents open in the workspace. Each document shows its views underneath.

New, Open, Save: use the panel toolbar or the command palette (Ctrl+K). A dot marks a document with unsaved changes.
Open a view: select a view under its document; it opens in a work-area tab.
Close: closing a document with unsaved changes asks whether to save first.
Undo and redo apply to the active document.

To change what a selected item contains, use the properties panel: see Properties panel. For help on this panel itself press F1, see Using the help panel.