The vertical bar in the margin indicates a tracked change is on that line to the right of the bar.

Name: The vertical bar in the margin indicates a tracked change is on that line to the right of the bar.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The vertical bar in the margin indicates that a comment or marginal note has been added to that line. Tracked changes are indicated by a vertical line in the main text, either in the left or right margin depending on the chosen display option.

The Vertical Bar in the Margin Indicates a Tracked Change