Steps to reproduce:

1. Create a new Unity project
2. Open UI Toolkit Samples via Window > UI Toolkit > Samples
3. Navigate to Control > Toggle Button Group
4. Reduce the window width using the vertical resizer bar
5. Observe the code section in the Toggle Button Group sample
6. Compare this behavior with other sample sections

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Actual results: The code section becomes blank when the window width is reduced

Expected results: The code section should remain visible and responsive, adjusting its layout as the window resizes, similar to other sections

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Reproducible with versions: 6000.0.54f1, 6000.1.13f1, 6000.2.0b11, 6000.3.0a3

Not reproducible with versions: 2022.3.61f1( No Toggle Button Group option)

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Tested on (OS):  Ubuntu 22.04, macOS