Unable to remove slugs from UID

[Priyanka (Priyanka Maheshwari)]

@svc

It's not related to slug. It's related to the UID field in Prismic editor. This means that another document in your repository already has this UID value. It could be a document that is drafted or in the archive.
Please check our article to unlock the old UId:

Error: This value is already used by another document

When adding a value to your UID field, you may encounter the following error: This value is already used by another <custom-type-name> document This means another document in your repository already has this UID value. It could be a document that is drafted or in the archive. If you can't find the document with this UID value, one of your documents used to have this UID value, and now it is locked. To re-assign a UID, you must delete the document that currently has that UID. This article will…

Let me know if the issue doesn't solve.

Thanks,
Priyanka