You might try to click the browser security that says "Full screen pop up with some java script security" We use Respondus Lock Down Browser but there's times when I've used this setting when we had technical issues surrounding an upgrade and Respondus was down for a day or so. There's also "Safe Exam Browser" that goes a step beyond the java script security option. I've never used it because we use Respondus but I think it's come a long way in the last year or so.
Quiz
Students Opening Quiz in Two Browsers
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