Description:

When a tool is selected, it's tool settings must be visible in the Tool Settings, as described in the Unity 23.1 Documentation: Unity - Manual: Default Scene view overlay reference (unity3d.com)

Also, per the Editor Authoring Standards: standards/US-0250.md at master · unity/standards (unity3d.com)

Repro Steps:

1. Set layout to "default"
2. Activate a Terrain Tool
3. View the Tool Settings overlay

Actual Results:

No settings are displayed in the Tool Settings, instead the overlay collapses to a drop-down.
If the dropdown is clicked, sometimes a portion of the settings are displayed.

Expected Results:

All of the active tool's settings are displayed in the Tool Settings.