Reproduction steps:
1. Create a new project
2. GameObject > Light > Reflection Probe
3. Select newly created Reflection Probe and observe “Probe Scene Editing Mode:” text in the Inspector

Actual result: Text is grey and barely visible
Expected result: Text is clearly visible

Reproducible with: 6000.0.65f1, 6000.3.4f1, 6000.4.0b4, 6000.5.0a4

Reproduced on: macOS Tahoe 26.2 (M4)

Note: Issue is reproducible with both Light and Dark Editor themes