**As** an OpenProject user
**I want** to be collapse or expand all work package hierarchies
**so** that I can quickly change my project's aggregation.

**Acceptance criteria**

* When the hierarchy mode is activated, it should be possible to collapse or expand all work packages.
* When collapsing work packages they should be collapsed to the highest displayed parent level.
* When expanding work packages all hierarchy levels on the work package list should be expanded (not just direct children).
* It should be possible to save the selected hierarchy mode (expanded or collapsed) in the view. Begin of the insertion
* End of the insertion Begin of the deletion

**Visuals (needs to be updated by a UX expert - may want to use an icon instead of text, placement of icon may need to be changed):**

End of the deletion When Begin of the insertionmoving throught the pagination the setting persist.End of the insertion Begin of the deletion at least one displayed work package hierarchy is expanded:End of the deletion

Begin of the insertion**Visuals**

End of the insertion <figure class="image"><img Begin of the insertionsrc="/api/v3/attachments/19992/content"></figure>End of the insertion Begin of the deletion src="/api/v3/attachments/19162/content"></figure>End of the deletion

Begin of the insertion**Out of Scope**End of the insertion Begin of the deletion When all displayed work package hierarchies are expanded:End of the deletion

Begin of the insertion* Saving the collapse status per parent element. Only saved by hierarchy level for the entire table.

**Open**

* Integration with existing hierarchy-mode switch.End of the insertion Begin of the deletion <figure class="image"><img src="/api/v3/attachments/19163/content"></figure>End of the deletion