To turn off the Reading Pane quickly for multiple folders, on the View tab, select Change View > Apply Current View to Other Mail Folders, and then choose folders in the Apply View dialog box. Selecting Off closes the Reading Pane only for the folder you’re in. The following are directions for using the Outlook desktop app on Windows. To turn on or move the Reading Pane: On the View tab, in the Layout group, select Reading Pane, and then select Right or Bottom. A combined inbox allows you to centralize email accounts from multiple providers. To turn off the Reading Pane: On the View tab, in the Layout group, select Reading Pane, and then select Off. The Reading Pane is turned on by default. Turn on, turn off, or move the Reading Pane In addition to using the Reading Pane to help you quickly scan your messages, you can also preview the first few lines of messages in your message list, and you can break up long messages by splitting the message window. You can customize how the Reading Pane works and appears, or you can turn it off. Then enter selection mode from top right and select all as unread: then select mark as read: Mark Yes below the post if it helped or resolved your problem. When you select a message in the message list, you can see the message in the Reading Pane and access many different types of file attachments.
