Steps to reproduce:
1. Create a new project and install the "AI Generators" package
2. Create a new GameObject
3. Open “Generate New Texture” window (AI > Generate new > Texture)
4. Press “Add More Controls To Prompt” button
5. Select “Image Reference” selection
6. Press pen icon in Image Reference section to open Doodle window
7. Draw with white color selected
8. Hover mouse over white colored parts and observe the brush

Actual results: Brush and its bounds are not visible
Expected results: Brush and its bounds are visible

Reproducible with versions: 1.0.0-pre.11 (6000.2.0b4), 1.0.0-pre.12 (6000.2.0b4)

Tested on (OS): macOS Sequoia 15.5 (Intel)