True when this scope is open/active and its contents may be submitted. Call EndMenuBar() only when true; on false, skip both contents and the matching end.
Use BeginMenuBar() on a window ImGuiWindowFlags.MenuBar to append to its menu bar.
Use BeginMainMenuBar() to create a menu bar at the top of the screen and append to it.
Use BeginMenu() to create a menu. You can call BeginMenu() multiple time with the same identifier to append more items to it.
Not that MenuItem() keyboardshortcuts are displayed as a convenience but not processed by Dear ImGui at the moment.
append to menu-bar of current window (requires ImGuiWindowFlags.MenuBar flag set on parent window).
Begin appending to the current window menu bar.