I'm a Transcription Co-ordinator. We support print-disabled students by providing them with alternative formats of course materials. We've been contacted by a visually impaired student who is having trouble with the captions on Studio. The student has some vision but is a large print user. Although I can see on Studio that it's possible to download the captions and to make adjustments in Word, this isn't practical for the student.
The Canvas Help Team got back to me really quickly to say they were not able to find any kind of setting that can be changed to enlarge the closed captions within Studio. (This is a feature on 'Panopto' video platform.)
The ability to adapt and enlarge the closed captions in Studio will benefit users who are visually impaired/print disabled and a range of other users.