Hi @n.belandres,
We're not sure we've seen this behavior before - usually that URL parameter should only appear when added in or with the Vercel toolbar.
Would you be able to record a Jam with the following steps:
- Open a document in the Prismic Page Builder.
- Make an edit and save.
- Preview the document.
- Show that the URL automatically appended
?__vercel_draft=1
.
If there's any information best kept private there, you can send me a private message on the forum and it won't be shared anywhere else. Thank you!