The History panel menu held only a disabled History Options… item. The
reference app's History panel menu has Step Backward and Step Forward,
which undo and redo a change, and Set History Limit, which sets the
number of History States.
The panel menu now has Step Backward and Step Forward. They run
edit.undo and edit.redo, and each is disabled when there is no step to
undo or redo, as Edit › Undo and Edit › Redo are. Set History Limit…
opens Preferences at Performance, where History States is set.
Docs: docs/target-app-parity.md.