As of right now when you go to the screen to manage item banks you are unable to return to a quiz or to Canvas and it does not even load into a different tab. I am having to either hit the back button until I find where I need to go or open up a new tab and find the course once again. Currently there is a "Return" button available when you open up a quiz for the new Quizzes LTI that takes you back to your Canvas course. Please add this for item banks as well.
Here is what it currently looks like when inside of a quiz:
Right now when you are in an item bank there is nothing as is showing below: