See File → New.
See File → Open.
Shift-click on this button to open a document in read-only mode.
See File → Save.
See File → Save All.
See Edit → Undo.
See Edit → Redo.
See Edit → Repeat.
See Edit → Command History.
See Edit → Cut.
See Edit → Copy.
See Edit → Paste Before.
See Edit → Paste.
See Edit → Paste After.
See Edit → Delete.
See Search → Find and Replace Element → Find and Replace Element.
See Tools → Remark → Insert or Edit Remark.