Steps to reproduce:
1. Create new Unity project using Universal 3D Template
2. Open Project Auditor window
3. Install Rules
4. In Project Areas choose “Assets” and Start Analysis
5. After analysis, go to Assets > Meshes
Right-click on Multi-column panel to open menu
6. Disable everything from the menu that is selected (Name, Vertices, Primitives, Topology, etc)
7. Observe the Console window

Actual results: Disabling last menu option from Multi-column panel in Project Auditor window throws “ArgumentException” error in the Console window

Expected results: The last remaining visible column should not be able to be disabled, either by greying out the last checked menu option or by preventing the action and showing a warning to the user

Reproducible with versions: 6000.3.14f1, 6000.4.7f1, 6000.5.0b9, 6000.6.0a5

Can’t test with versions: 6000.0.74f1 (Project Auditor is not available)

Tested on (OS): macOS Tahoe 26.4.1

{code:java}
ArgumentException: visibleColumns should should not be set to an empty array. At least one visible column is required.
UnityEditor.IMGUI.Controls.MultiColumnHeaderState.set_visibleColumns (System.Int32[] value) (at /Users/bokken/build/output/unity/unity/Editor/Mono/GUI/TreeView/MultiColumnHeaderState.cs:178)
UnityEditor.IMGUI.Controls.MultiColumnHeader.ToggleVisibility (System.Int32 columnIndex) (at /Users/bokken/build/output/unity/unity/Editor/Mono/GUI/TreeView/MultiColumnHeader.cs:560)
Unity.ProjectAuditor.Editor.UI.Framework.PAMultiColumnHeader.MyToggleVisibility (System.Object userData) (at ./Library/PackageCache/com.unity.project-auditor@6cc18ad506e9/Editor/UI/Framework/IssueTable.cs:22)
UnityEditor.GenericMenu.CatchMenu (System.Object userData, System.String[] options, System.Int32 selected) (at /Users/bokken/build/output/unity/unity/Editor/Mono/GUI/GenericMenu.cs:160)
{code}