The correct option is Swimlanes.

The Swimlanes feature groups issues into horizontal lanes so you can create a lane per project and keep every issue visible on the board. Swimlanes are configured to separate work by project or by JQL so they show all issues in their respective lanes rather than hiding them with additional filtering.

Board Sub Filter is incorrect because it further restricts which issues appear on the board and would hide issues rather than group them.

Issue Detail View is incorrect because it only shows details for a selected issue and does not change how issues are grouped on the board.

Quick Filters is incorrect because quick filters temporarily hide issues to narrow focus and they do not provide persistent grouping by project.

Hide Completed Issues is incorrect because that option removes completed work from view and so it will not keep every issue visible.

Board Filter is incorrect because the board filter determines the overall issue set shown and is used to limit issues across the board rather than to group issues by project.

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