Freeze-frame on a Mac

I am an amateur at both Shotcut and Macs. But I’m learning.
I’ve searched for and watched many youtube vids on how to export a single frame from a video clip but every one I see is with a PC and shows using the “File” / “Export Frame” commands at the upper right corner. My version of Shotcut on my iMac doesn’t have the “File” button to start with.
Does anyone know if there is a Mac way, or do I need to change a setting on Shotcut to show those?

It is a macOS thing that the main menu is at the very top of the screen. Same goes for Shotcut on Mac.