The Quiz, when previewed, is displayed on 50% of my screen, and the remaining 50% is white space on the left. How do I change the frame size to full to utilise the entire screen space ?
I do not see this problem on my Moodle site, Quiz uses full screen.
Which Moodle theme are you using?
Moodle 3.9.1 using the default theme provided by Moodle
Moodle theme is laid out like this for a reason: https://en.wikipedia.org/wiki/Line_length
Found a solution to this problem. The workaround is to choose 'None' instead of 'Full Screen Pop-up with some JavaScript security' under the quiz option "Extra Restriction on Attempt". You may have to reveal the option by clicking "Show more" link.