diff --git a/src/main/java/org/nwapw/abacus/fx/AbacusController.java b/src/main/java/org/nwapw/abacus/fx/AbacusController.java
index 6e5332a..bbf5bc6 100644
--- a/src/main/java/org/nwapw/abacus/fx/AbacusController.java
+++ b/src/main/java/org/nwapw/abacus/fx/AbacusController.java
@@ -46,6 +46,12 @@ public class AbacusController implements PluginListener {
      */
     private static final String ERR_EVAL = "Evaluation Error";
 
+    @FXML
+    private TabPane coreTabPane;
+    @FXML
+    private Tab calculateTab;
+    @FXML
+    private Tab settingsTab;
     @FXML
     private TableView<HistoryModel> historyTable;
     @FXML
@@ -143,6 +149,9 @@ public class AbacusController implements PluginListener {
         parsedColumn.setCellValueFactory(cell -> cell.getValue().parsedProperty());
         outputColumn.setCellFactory(cellFactory);
         outputColumn.setCellValueFactory(cell -> cell.getValue().outputProperty());
+        coreTabPane.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
+            if(oldValue.equals(settingsTab)) alertIfApplyNeeded(true);
+        });
 
         abacus = new Abacus();
         abacus.getPluginManager().addListener(this);
diff --git a/src/main/resources/abacus.fxml b/src/main/resources/abacus.fxml
index 8d8567c..9cc8e70 100644
--- a/src/main/resources/abacus.fxml
+++ b/src/main/resources/abacus.fxml
@@ -11,8 +11,8 @@
             xmlns:fx="http://javafx.com/fxml"
             fx:controller="org.nwapw.abacus.fx.AbacusController">
     <center>
-        <TabPane>
-            <Tab text="Calculator" closable="false">
+        <TabPane fx:id="coreTabPane">
+            <Tab fx:id="calculateTab" text="Calculator" closable="false">
                 <BorderPane>
                     <center>
                         <TableView fx:id="historyTable">
@@ -41,7 +41,7 @@
                     </bottom>
                 </BorderPane>
             </Tab>
-            <Tab text="Settings" closable="false">
+            <Tab fx:id="settingsTab" text="Settings" closable="false">
                 <GridPane hgap="10" vgap="10">
                     <padding><Insets left="10" right="10" top="10" bottom="10"/></padding>
                     <Label text="Number Implementation" GridPane.columnIndex="0" GridPane.rowIndex="0"/>