Reproduction steps:
{}{}1. Create a new project
2. Create a 3D GameObject
3. Enable Contribute GI Static status in the Inspector
4. Open Lighting window (Window > Rendering > Lighting)
5. Press “Generate Lighting” button
6. Click on 3D GameObject in the Hierarchy
7. Open Baked Lightmap Viewer window by clicking “View” button in the Inspector (Mesh Renderer > Lightmapping > Baked Lightmap)
8. Make sure Viewer window is at its minimum size and observe the slider on the top of the window

Actual result: Slider disappears when the window is minimised, leaving empty space between its field and its icon
Expected result: Nothing of note happens

Reproducible with: 2021.3.56f1, 2022.3.66f1, 6000.0.57f1, 6000.2.4f1, 6000.3.0b1

Reproduced on: Windows 11

Note: Changing field by clicking and dragging only works when the action is performed over the icon, but the large gap between the icon and the field makes this unclear