Add ability to hide the new Complete button from users

I just discovered the new Complete Project functionality with the latest Summer 19 release of TaskRay (https://support.taskray.com/hc/en-us/articles/360023924254-Complete-Projects) that includes a "Complete" button on the project with options to just complete the project or walk through an onboarding project completion, as well as two new fields that get populated on the project upon completion (Completed checkbox and Actual Completion Date date field). Since our use cases do not include any onboarding projects at all, and since we have not decided to use the new Complete Project functionality (since it would involve migrating historical projects to fill in these new fields with data, changing our business processes, and updating numerous reports to reflect the changes - a giant effort), I would like to be able to HIDE the new Complete button from users. Please make this possible. Thanks