I'm rewriting our CRM's Office 365 business rules. I the old ones I turned it off due to new form changes.
When I deactivate business rules, the affected fields remain affected.
Even though the rules are deactivated, the fields keep running. I've cleared my browser cache and used different computers, so it's not a client-machine issue.
EDIT:
For security reasons I can't share the names of the business rules, but I have attached an image to show they are deactivated.
In the design view of the form, for example there are these 3 fields:
However, in the live view this is displayed:
Here's a link that may help you.
Create business rules in Dynamics 365 Customer Engagement (on-premises) | Microsoft Learn