Export the configuration

config/sync/block.block.octavia_main_menu.yml

@@ -0,0 +1,26 @@
+uuid: ffb347df-b893-4c77-bfb3-54b3f9a3374e
+langcode: en
+status: true
+dependencies:
+  config:
+    - system.menu.main
+  module:
+    - system
+  theme:
+    - octavia
+_core:
+  default_config_hash: '-GYFkdwy2i0163rMx99Cxo9jHfj7lngADq0BZbnTUi0'
+id: octavia_main_menu
+theme: octavia
+region: primary_menu
+weight: 1
+provider: null
+plugin: 'system_menu_block:main'
+settings:
+  id: 'system_menu_block:main'
+  label: 'Main navigation'
+  provider: system
+  label_display: '0'
+  level: 1
+  depth: 2
+visibility: {  }