@thof
There is a feature called "Assignment Allowed Attempts." If your Canvas Administrator has allowed it, you can go into your Course Settings > Features and turn it on.

Then, when you edit an assignment, you can specify how many attempts you would like to give the students.

Setting it to 1 would keep students from submitting the assignment more than once.
Some faculty encourage students to turn it in early and say if you do, I'll provide feedback and let you correct it. Others want students to have it right the first time and only get one attempt. Some are in the middle (like me) and I tell the student that I'm only grading this once, it's not a turn-it-in-until-it's-acceptable assignment (I have those as well -- they're graded as complete/incomplete) -- however, I realize that sometimes students turn in the wrong assignment or turn in something blatantly not even close to what I asked for, so I do allow multiple submissions. Because I let them know what kind of assignment it is, the issue is not normally abused.
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