This setting controls how submissions that require a review get assigned to a reviewer as a request to review.
Manual Manually assigning submissions is tedious, however sometimes required if many rules determine who can review what.
Automatic: Random Each submission is randomly assigned to a member of the "Reviewer Group" that was set on the "Review Phase" that is currently active. Read more about phases _here_.
Automatic: Queue Each reviewer in the "Reviewer Group" has a number of submissions awaiting their review. To balance out over-utilization of some reviewers, and to give reviewers with more availability higher volume, submissions can automatically be assigned to the member in the group of reviewers that has the least number of outstanding submissions to be reviewed.
Automatic: Smart Based on observed reviewer behavior we can forecast the expected time when the review will be completed by a reviewer. Utilizing this, this setting will assign the submission to the reviewer who is expected to review this submission the earliest.
Please note, a submission can only be reviewed by a reviewer, and reviewers can only review submissions that are assigned to them.