I'm loving Mura more each day. Thanks to CatherineMM at the Mura Forums for the most simple way to achieve this:
"If you add "Go to First Child" (under System) in the Display Objects for Products, you should be all set!".
To do what my questions asks:
- The top level Menu item (Products).
- Go to "Layout & Objects".
- Under 'Content Objects" select "System".
- Then "Go to first child" and move into main content area.
That's it.. then when I click 'Products', it just opens 'Product1'.