Modes

Modes are only live, track, and view on every format.

Mode	Behavior
live	Selection and edits. History list is hidden; the page shows the current document.
track	Selection and edits. The history list shows each change. Text documents draw insertions and deletions on the page.
view	Read-only. Editing controls stay visible and disabled when the format supports them.

There is no PDF View/Edit switch and no second page-mode control.