The Update Set picker is not visible anymore in the UI16 since Jakarta, as opposed to Geneva, where it used to work.
This is due to the introduced system property 'glide.ui.update_set_picker.enabled' that gets added with the "com.glide.ui.concourse" plugin. The property value will decide the presence or not of updateset_picker in UI16.
true => update set picker is visible in UI16
false => update set picker is hidden in UI16