Reveals or conceals the content of the action bar.
Note: this does not show or hide @action_bar in the [property@Gtk.Widget:visible] sense, so revealing has no effect if the action bar is hidden.
The new value of the property
See Implementation
Reveals or conceals the content of the action bar.
Note: this does not show or hide @action_bar in the [property@Gtk.Widget:visible] sense, so revealing has no effect if the action bar is hidden.