outlook is stuck on the option to have the huge reader pane, with no way to change it back. There is nothing at the top of the page, like settings, menu, delete, account. Outlook is useless as it is.

There is nothing at the top of the page. I have a small column for types of emails (input, junk, etc), a medium column for the email, and a huge reader pane. The only way I can delete an email is to open it, including junk. There is no settings, account, delete, or anything at the top to select to control my outlook. I cannot change the size of the reader pane or go to older pages of emails. It looks like I need to do a master reset, but I see no way to do that. My outlook is essentially useless as it is.