All Toolbars Missing in Message Window

Hi, thanks in advance for answering this question. I am missing all toolbars in my Message Window. I was trying to add a third toolbar and unchecked the two existing ones (Menu Bar and Mail Toolbar) and now I have none and can't see any way to restore them. Under Tools>Options>Advanced>Reading & Display under "Open Messages in:", I have chosen option "An existing message window". When I double click a line item in my inbox, it opens a message window. That message window has no toolbars. Without any toolbar, you can't right click and restore them. There is no button with three lines ("Display the Thunderbird Menu" tool tip) to click on. How do I restore Menu Bar and the Mail Toolbar in the message window?