Thank you for your message, and I’m glad to hear the issue is now resolved.
The problem was caused by an override of the SP Page Builder backend that was present in your administrator template. This override was based on an older version of SP Page Builder and was not fully compatible with the current version, which led to the issue you experienced.
To resolve it, I simply removed the outdated override from the administrator template. This restored the default backend functionality of SP Page Builder and resolved the issue.
If you encounter a similar issue in the future, checking and removing any outdated overrides related to SP Page Builder from your administrator template should help.
Please don’t hesitate to reach out if you need further assistance.
Please marked the issue as solved