Begin of the insertion### Acceptance Criteria

* There is a new entry in the Project settings called "Project attributes"
* All project custom fieldsEnd of the insertion Begin of the deletion TheseEnd of the deletion are Begin of the insertionlisted in boxes, grouped by their sections inEnd of the insertion Begin of the deletion just notes to facilitateEnd of the deletion the Begin of the insertionsame order as definedEnd of the insertion Begin of the deletion implementation. The authoritative specification isEnd of the deletion in Begin of the insertionthe global admin page ((visible settingEnd of the insertion Begin of the deletion <mention class="mention" data-id="49688" data-type="work_package" data-text="#49688">#49688</mention>

(Note: `Project Attributes`End of the deletion is Begin of the insertionrespected, only admins can see/enable/disable &quot;invisible&quot; project attributes)
* The order of section/attributes cannot be changed here
* The project attributes are shown with their name, type andEnd of the insertion a Begin of the insertionbadge &quot;required&quot; if they are required
* Each project attribute can be enabled/disabled (activated/deactivated)End of the insertion Begin of the deletion new nameEnd of the deletion for the Begin of the insertioncurrent project using the toggle switch (except required ones)
* The toggle switch is disable for required project attributes (in the on position)
* No extra confirmation is shown after using the toggle switch
* The &quot;enable all&quot;/&quot;disable all&quot; buttons per section allow bulk actions in order to mass edit the activation stateEnd of the insertion Begin of the deletion existing conceptEnd of the deletion of Begin of the insertionproject attributes
End of the insertion Begin of the deletion `Project Custom Fields`)

### Acceptance criteria

End of the deletion * Begin of the insertionRequiredEnd of the insertion Begin of the deletion Enable/disableEnd of the deletion project Begin of the insertionattributes always stay activated and are not affected by the bulk edit buttons
* No extra confirmation is shown after using the mass edit buttons
* Disabling a project attribute does _not_ delete an assignedEnd of the insertion custom Begin of the insertionvalue
* A disabledEnd of the insertion Begin of the deletion fields onEnd of the deletion project Begin of the insertionattribute and its custom value:
* Will not be shown in theEnd of the insertion Begin of the deletion level via newEnd of the deletion project Begin of the insertionoverviewEnd of the insertion Begin of the deletion settingsEnd of the deletion page Begin of the insertionsidebar (specs below)
* Will not be exported (specs below)
* Cannot be targeted by a filter in the project list (specs below)End of the insertion
* Begin of the insertionFor more convenience, the list can be filtered by project attribute nameEnd of the insertion Begin of the deletion Add client-side filteringEnd of the deletion and Begin of the insertiontype via search input below the header
End of the insertion Begin of the deletion buld-edits on this UI for better UX

### Technical notes

End of the deletion * Begin of the insertionWhen a filter is active, the bulk edit buttons are hidden
* URL routing: `projects/{project_id}/settings/project_custom_fields`
* Accessible to project members with the permission &quot;select\_project\_custom\_fields&quot;End of the insertion Begin of the deletion Introduce mapping table `custom_fields` &lt;-&gt; `projects`End of the deletion