Hi Jos,
Thanks for reaching out.
The Index option is usually greyed out because an Articles Index page already exists on your site. SP Page Builder allows only one Index page (and one Detail page) for Joomla Articles. Please check the following:
- Go to SP Page Builder > Pages and look for an existing Article Index page. It may have been created earlier.
- Check the Trashed pages too. A trashed Index page still counts, so delete it permanently from the trash.
- After that, go to Pages > + Add > New Article Page > Index. The option should now be available.
If you already have an Index page, you don't need a new one. Just open it and customise it with the Collection addon, with the Source set to Articles.
Step-by-step guide: https://www.joomshaper.com/documentation/sp-page-builder/creating-an-article-index-page
If the option is still greyed out, please share your SP Page Builder version and a screenshot, and add admin access in the Hidden Content field so we can check.
Best regards,