Missing menu bar in Numbers on macOS 14.3

Numbers on the iPad has a different interface suited to that platform.

You should see a row of icons up top and that's it. No "menu" like the one you would see in Numbers for the Mac.

Numbers User Guide for iPad - Apple Support

SG

Are you running the app full-screen?

What happens when you run the mouse to the top of the screen? does it appear then?

What about if you hit the green button in the window title bar?