Tidied up new user interface (and fixed problem with re-loading only activity from Android Studio)

app/src/main/res/layout/fragment_system.xml

@@ -9,7 +9,7 @@
     <!-- TODO: Update blank fragment layout -->
     <androidx.appcompat.widget.LinearLayoutCompat
         android:layout_width="match_parent"
-        android:layout_height="253dp"
+        android:layout_height="match_parent"
         android:orientation="vertical"
         android:id="@+id/fragment_ll">