states kind of work...

src/play.rs

@@ -198,5 +198,5 @@ pub(crate) fn place_card(
     );
 
     // Set it to visible
-    *visibility = Visibility::Visible;
+    *visibility = Visibility::Inherited;
 }

src/setup.rs

@@ -84,6 +84,7 @@ pub(crate) fn setup_set_check_button(mut commands: Commands) {
                 align_items: AlignItems::Center,
                 ..default()
             },
+            Visibility::default(),
             ViewState::Play,
             BackgroundColor(Color::BLACK.with_alpha(0.8).into()),
         ))

src/view.rs

@@ -5,7 +5,8 @@ pub struct ViewPlugin;
 
 impl Plugin for ViewPlugin {
     fn build(&self, app: &mut App) {
-        app.add_observer(state_monitor).init_state::<ViewState>();
+        app.init_state::<ViewState>()
+            .add_systems(Update, state_monitor);
     }
 }
 
@@ -31,22 +32,19 @@ pub(crate) fn button_set_state<S: FreelyMutableState + Clone>(
 }
 
 fn state_monitor(
-    trigger: Trigger<StateTransitionEvent<ViewState>>,
+    mut events: EventReader<StateTransitionEvent<ViewState>>,
     mut entities: Query<(&ViewState, &mut Visibility)>,
 ) {
-    entities
-        .iter_mut()
-        .for_each(|(view_state, mut visibility)| {
-            info!(
-                "Transition from {:?} to {:?}",
-                trigger.event().exited,
-                trigger.event().entered
-            );
-            if Some(view_state) == trigger.event().exited.as_ref() {
-                *visibility = Visibility::Hidden;
-            }
-            if Some(view_state) == trigger.event().entered.as_ref() {
-                *visibility = Visibility::Inherited;
-            }
-        });
+    events.read().for_each(|event| {
+        entities
+            .iter_mut()
+            .for_each(|(view_state, mut visibility)| {
+                info!("Transition from {:?} to {:?}", event.exited, event.entered);
+                if Some(view_state) == event.entered.as_ref() {
+                    *visibility = Visibility::Inherited;
+                } else {
+                    *visibility = Visibility::Hidden;
+                }
+            });
+    });
 }