Update MarkerExtension.php

Override Lat Lng was not displaying editable fields.
Added logic to check status and display either the MapBox or the editable fields.

src/MarkerExtension.php

@@ -4,6 +4,7 @@
 namespace A2nt\SilverStripeMapboxField;
 
 use SilverStripe\Forms\CheckboxField;
+use SilverStripe\Forms\TextField;
 use SilverStripe\Forms\FieldList;
 use Symbiote\Addressable\Geocodable;
 use Symbiote\Addressable\Addressable;
@@ -36,8 +37,19 @@ class MarkerExtension extends Geocodable
         $fields->addFieldsToTab('Root.Map', [
             CheckboxField::create('LatLngOverride', 'Override Latitude and Longitude?')
                 ->setDescription('Check this box and save to be able to set the latitude and longitude manually.'),
-            MapboxField::create('Map', 'Choose a location', 'Lat', 'Lng'),
-        ]);
+            ]);
+
+            if ($record->LatLngOverride) {
+                $fields->addFieldsToTab('Root.Map', [
+                    TextField::create('Lat', 'Latitude'),
+                    TextField::create('Lng', 'Longitude'),
+                ]);
+            }
+            else {
+                $fields->addFieldsToTab('Root.Map', [
+                    MapboxField::create('Map', 'Choose a location', 'Lat', 'Lng'),
+                ]);
+            }
     }
 
     public function getDirectionsURL()