Change the paper size for every page in a pattern. Open File, then choose Page size. The dialog shows Letter as the current format. Read the note: the change applies to all pages, including master pages; content keeps its size and position. Select A4, then choose Apply to all pages. Wait for Saved and review the layout after changing formats. Reopen File > Page size to confirm that A4 is now marked Current. The wait while reopening the dialog has been shortened in this recording.