gtk:application-window-help-overlay (window)

window -- a gtk:application-window widget
overlay -- a gtk:shortcuts-window widget

Gets the shortcuts window, or associates a shortcuts window with the application window, and sets up an action with the name "win.show-help-overlay" to present it. The window takes responsibility for destroying the help overlay. This function is deprecated since 4.18. The gtk:shortcuts-window widget will be removed in GTK 5.