When assignment enhancements are turned on students lose the ability to view the Turnitin similarity report on the student assignment feedback page. Adding this score would be beneficial to the students. And it is available with the enhancements turned off. With the new enhancements, they are unaware there is even a similarity score unless they click Grades which is usually after the assignment has been graded so they miss the opportunity to make improvements and resubmit. 

I am not sure where it should go on the page. Looks like there isn’t a lot of real estate for smaller browsers to put it near the grade area. Maybe by the submitted attempts area (see hopefully attached image). Or maybe could go somewhere in the flyout view feedback box.

I understand that Turnitin is an add on and have contacted their customer support. They said it is a Canvas issue.