LockDown Browser must be enabled in your Canvas Course.
To enable LockDown Browser in your course first go to your Course Settings:
Next click on the Navigation tab and scroll down to find LockDown Browser
You can either drag and drop item to the course navigation section at top or you can click on the 3 dot icon and click on Move and drag to the top:
You can place the LockDown Browser wherever you like making sure to hit Save to finalize placement.
Congratulations! You have now enabled LockDown Browser and are ready to create quizzes requiring LDB.
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