The error only occurs when editing in the backend; it does not occur when editing in the front end.
Answer from Godaddy hosting:
Thank you for reaching out regarding the 403 error you're experiencing with JoomShaper in your Joomla installation.
We understand how frustrating these types of issues can be when you're trying to manage your website content.
We've conducted a thorough review of your server configuration and found that while ModSecurity was installed, there were no active rules or vendor configurations that would typically cause the blocking behavior you're experiencing. As a precautionary measure, we've removed ModSecurity from your server to eliminate it as a potential cause. This can easily be reinstalled later if needed and you determine it wasn't the source of the problem.
but the error still appears with the change on the server.