After clicking Edit the Test Options, the seventh section is titled Test Presentation:
These options dictate how the test will be presented to the students while they are taking the assessment.
You can either choose to allow students to see the questions All at Once or only One at a Time. This is a matter of instructor preference.
There is also an option to enable Prohibit Backtracking. This means that once a student moves on from a question, they will be unable to go back to it. This option only works when One at a Time is selected.
The final option is Randomize Questions for each test attempt. This will ensure that the questions do not appear in the same order for every student.