Looking for the example(s) of the hamburger icon with menu in Vala

Applications
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2

Are you looking for GMenu with GAction? For that there was once this thread, and I created a Nim GTK3 example once. Should be similar for GTK4 and Vala:

How to create menus for apps using Python?

GitHub - StefanSalewski/gintro: High level GObject-Introspection based GTK3/GTK4 bindings for Nim language