Option to change view of diffs easily overlooked
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=233282) </details> <!--IssueSummary end--> Several participants noted they were unaware they could view diffs side by side and often they stumbled upon the option by accident. Those with a high number of changes to review preferred the side by side view as it made reviewing more efficient. **Actionable insight:** - Provide a visual affordance to indicate diff views can be switched between top/bottom and side by side. [Dovetail Insight](https://dovetailapp.com/projects/8caf91dc-8b99-4e05-b040-57428bf55b5c/insights/present/21a316fe-e26f-44fc-8320-dd630def22f4)
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