*Description:*

Overlays in 23.1 should always be user-hideable, via the right-click-on-header menu, per documentation: [Unity - Manual: Display or hide an overlay (unity3d.com)|https://docs.unity3d.com/2023.1/Documentation/Manual/display-and-hide-overlay.html]

Also, per Unity Standards: [standards/US-0249.md at master · unity/standards (unity3d.com)|https://github.cds.internal.unity3d.com/unity/standards/blob/master/definitions/US-0249/US-0249.md]

*Repro Steps:*
# Activate a Terrain tool
# Attempt to hide any of the overlays opened by the tool

*Actual Results:*

The overlay cannot be hidden

*Expected Results:*

The overlay can be hidden