How to reproduce:
1. Open the “IN-105687.zip“ project
2. Open the “MainScene“ Scene
3. In the Hierarchy, select the “LogUI > Scroll View > Viewport > Text” GameObject
4. Observe the Preview window at the bottom of the Inspector

Expected result: The buttons are visible on the right side of the header
Actual result: Only text is seen along the whole header, but no buttons

Reproducible in: 2023.2.0a23, 6000.0.51f1, 6000.1.9f1, 6000.2.0b7, 6000.3.0a1
Not reproducible in: 2022.3.63f1
Could not test in: 2023.1.0a1, 2023.2.0a1 (Unsolvable or very time-consuming package and script-related errors)

Reproduced on: Windows 11 Pro (24H2)
Not reproduced on: No other environment tested

Notes:
- In a floating window, the behavior is the same
- Before regression, the buttons were aligned to the Inspector's right and prioritized over the name. However, in a floating window, it acts the same as in the post-regression versions - the name pushes buttons out
- If the Inspector is expanded enough, the preview window buttons become visible again