I want to make the ribbon size in Word smaller, as it is occupying too much space in my page. Where do I find the Quick Access Toolbar which, I understand, must be used to change the ribbon size? Thank you for helping me.
Joe

I am not sure how to achieve what you are desiring.
There is a drop-down menu which includes Ribbon Preferences ... at the far-right side of the second layer from the top. Check if these options can achieve what you are wanting.
There's also the toolbar drop-down View menu options. Firstly Ribbon, then Toolbars and then Customising Toolbars & Menus.

and Ribbon Settings:

I'm using quite an old version of Word but it suits my basic needs.

Perhaps I now understand what you are after. See the upward arrow to the far-right of my image above, click it and the ribbon will disappear. Also in Ribbon Preferences there's an option to Expand ribbon when document opens that can be disabled. I've shown the arrow below you can select.



You can also achieve this using a keyboard shortcut or under View menu choose Ribbon. That will either show or hide the Ribbon.