add GND zone

esp32_midi/esp32_midi.kicad_prl

@@ -1,6 +1,6 @@
 {
   "board": {
-    "active_layer": 49,
+    "active_layer": 0,
     "active_layer_preset": "",
     "auto_track_width": true,
     "hidden_netclasses": [],

esp32_midi/esp32_midi.kicad_pro

@@ -46,7 +46,7 @@
         "silk_text_upright": false,
         "zones": {
           "45_degree_only": false,
-          "min_clearance": 0.508
+          "min_clearance": 0.0
         }
       },
       "diff_pair_dimensions": [],