Is there any reason why a QMenu cannot be added from the Qt Designer? I find it weird that you can add other widget types but not this.
Adding menu editing for every widget in the designer would probably make a very awkward and inconvenient UI. There's really no place you can visualize it on.
If you're editing a QMainWindow you can edit the menu bar and its popups because there's a proper place for them to be displayed in.
how can I add a QMenu and QMenuItems to a window from Qt Designer