diff --git a/config/assembler.yml b/config/assembler.yml
index dce91d96d..209b67eac 100644
--- a/config/assembler.yml
+++ b/config/assembler.yml
@@ -23,6 +23,7 @@ environments:
     feature_flags:
       WEBSITE_SEARCH: true
       ASSEMBLER_API_EXPLORER: true
+      NAVIGATION_PREVIEW: true
     website_search_url: https://staging-website.elastic.co/search/elastic-website-search.js
   edge:
     uri: https://d34ipnu52o64md.cloudfront.net
@@ -30,6 +31,8 @@ environments:
     content_source: edge
     google_tag_manager:
       enabled: false
+    feature_flags:
+      NAVIGATION_PREVIEW: true
   # TODO: remove 'local' and switch CI synthetics to use 'dev' explicitly once
   # NAVIGATION_PREVIEW is the default (at which point the pages-dropdown step
   # in navigation-test.journey.ts should be replaced with a top-nav step).