To duplicate. Export large document to Print PDF, attempt to save while exporting, but background task prevents saving, ok, but only available option is cancel.
Change would be to add another button to the dialog box to bring up the Background Task progress bar.
Or an OK button to just return to unsaved document, but panel could then be opened to follow progress.
Or leave dialog open and allow access to the small animated progress indicator in the top bar to open full background task panel.
Or allow access to the panel/tab from the sidebar.

thank you