The menu bar does not exist any more indeed. Menu bars are deprecated in Gnome. This is reflected in all Gnome applications, except
gnome-terminal, shipping without a menu bar.
- Many actions you do with specific items (aka files and folders) are available through the right-click menu
- The hamburger menu provides options with respect to the view
- The application menu, in the top bar of Gnome Shell, displays application wide options.
Like it or not, this is how the Gnome developers see software evolving. If you do not want to adapt to this vision, there are still a plethora of alternative desktops where the "traditional" menu bar is considered the prime reference point for the user to locate commands. The Cinnamon desktop for example, explicitly chooses to retain traditional user interfaces (titlebars, menubars). It therefore forked Nautilus into Nemo, which maintains the global menu. In addition, they have created "x-apps", which are forks of the gnome apps that retain the classical title bar and the menu bar (Xedit, Xviewer, Xreader, etc.)