Can I edit the priority field?

No. You can’t add or change values in the priority field. This field is a standard ticket field. An admin can only set the priority Field values between Low, Normal, High, Urgent or Normal, High.

To resolve this, create a custom ticket field with the priority values you need in your workflow. Do not deactivate the priority field to use a custom field as a replacement. This action directly affects your service level agreement (SLA) policies and analytics reports.