Steps to reproduce:

1. Create a course
2. Create a quiz
3. Add a random question to the quiz.
4. Click on "Switch bank" and confirm that the modal switches to the list of available banks.
5. Click "Go back" and save the question with the default filters (there don't actually need to be any questions to reproduce this).
6. Click the "Configure question" link (pencil icon) on the new question.
7. On the editing page, click the "Switch bank" button.
   • Expected: The list of available banks is displayed
   • Actual: Nothing happens.

The issue is that the form for editing the random question settings is not in a modal, but rather on a separate page (which is slighly weird and confusing UI), but then the switch question bank interface assumes that it is running in a modal.

So, probably the best way to fix this is to improve the UI, and move the edit random question settings form into a Modal.