Lobby start button is hidden/disabled by default, to avoid it being visible to non-host clients for a split seconds while loading screen.

racevisionGame/src/main/resources/visualiser/scenes/gameLobby.fxml

@@ -9,7 +9,7 @@
 <?import javafx.scene.layout.RowConstraints?>
 <?import javafx.scene.text.Font?>
 
-<AnchorPane fx:id="gameLobbyWrapper" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="600.0" prefWidth="780.0" style="-fx-background-color: rgba(100, 100, 100, 0.2);" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="visualiser.Controllers.InGameLobbyController">
+<AnchorPane fx:id="gameLobbyWrapper" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="600.0" prefWidth="780.0" style="-fx-background-color: rgba(100, 100, 100, 0.2);" xmlns="http://javafx.com/javafx/8.0.112" xmlns:fx="http://javafx.com/fxml/1" fx:controller="visualiser.Controllers.InGameLobbyController">
     <children>
       <GridPane style="-fx-background-color: rgba(0, 0, 0, 0.3);" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
          <children>
@@ -71,7 +71,7 @@
                   <Font name="Cabin-Bold" size="17.0" />
                </font>
             </Label>
-            <Button fx:id="startButton" mnemonicParsing="false" onAction="#startBtnPressed" text="Start!" GridPane.columnIndex="2" GridPane.rowIndex="2" />
+            <Button fx:id="startButton" disable="true" mnemonicParsing="false" onAction="#startBtnPressed" text="Start!" visible="false" GridPane.columnIndex="2" GridPane.rowIndex="2" />
          </children>
          <columnConstraints>
             <ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />