Hi @StardustLuna ...
There is nothing in Canvas that I am aware of that would disable the Ctrl+F or Cmd+F keyboard shortcuts for your students. To be honest, I am not sure if this would even be considered Canvas functionality...because this keyboard combination can be used for a wide variety of applications on your computer...not just Canvas. Searching Google a little bit, people mention there are extensions you can install in a Chrome browser, but I have no idea how those extensions work...and I assume if those extensions are used, they have to be installed/added to every computer that wants to use them.
While I understand why you'd want to do this, I'm just not sure it's really possible. I could be wrong, though...who knows.
Sorry that I don't have better information for you, but I hope this helps to answer your questions.
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