To avoid editing errors on page spreads, only one editor can edit the pages at a time. This includes Portrait Auto Flow pages, The page spread will lock when an editor is working on a page. Other editors will be locked out and see the message below if they try to edit the page. Once the editor has exited the page, the page spread will be unlocked for editing by another editor.
You can assign single pages to editors for editing.
If two editors are assigned to the single pages on a page spread, only one can work on their page at a time. They will see this message when they go to the page spread to edit their assigned page if the other assigned editor is not working on their page.