GimpUi.ScrolledPreview.prototype.set_policy

function set_policy(hscrollbar_policy: Gtk.PolicyType, vscrollbar_policy: Gtk.PolicyType): void {
    // Gjs wrapper for gimp_scrolled_preview_set_policy()
}
  

Since 2.4

hscrollbar_policy

policy for horizontal scrollbar

vscrollbar_policy

policy for vertical scrollbar