Fix #581: Do not display default/active menu options in WP

engines/wordpress/nucleus/particles/menu.yaml

@@ -0,0 +1,51 @@
+name: Menu
+description: Gantry menu
+type: particle
+
+form:
+  fields:
+
+    enabled:
+      type: input.checkbox
+      label: Enabled
+      description: Globally enable the menu particle.
+      default: true
+
+    _info:
+      type: separator.note
+      class: alert alert-info
+      content: GANTRY5_PARTICLE_MENU_INFO
+
+    base:
+      type: input.text
+      label: Base Path
+      description: Select the base path.
+      default: /
+
+    menu:
+      type: menu.list
+      label: Menu
+      description: Select menu to be used with the particle.
+      default: ''
+      selectize:
+          allowEmptyOption: true
+      options:
+        '':  '- Select Menu -'
+
+    startLevel:
+      type: input.text
+      label: Start Level
+      description: Set the start level of the menu.
+      default: 1
+
+    endLevel:
+      type: input.text
+      label: Max Levels
+      description: Set the maximum number of menu levels to display.
+      default: 0
+
+    mobileTarget:
+      type: input.checkbox
+      label: Mobile Target
+      description: Check this field if you want this menu to become the target for Mobile Menu and to appear in Offcanvas
+      default: 0