*Steps to Reproduce:*
# Create a new project
# Install the "2D Tilemap Editor" package from the Package Manager
# In the Hierarchy Window, create a Tilemap via 2D Object > Tilemap > Rectangular
# In the Scene View Overlays, click Open Tile Palette
# Dock the Tile Palette window beside the Inspector
# Resize the Tile Palette window from left to right
# Observe the behaviour of the "Default Brush" dropdown

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*Actual results:* The height of the "Default Brush" dropdown expands and fills the entire section

*Expected results:* The height of the dropdown remains unchanged, consistent with other dropdowns in the window

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*Reproducible with versions:* 1.0.0 (6000.0.5f1, 6000.0.45f1, 6000.1.0b15, 6000.2.0a9)

*Not reproducible with versions:* 1.0.0 (2022.3.60f1, 6000.0.4f1)

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*Tested on (OS):* macOS 15.5

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*Notes:* The behaviour of this dropdown should be consistent with the rest of the dropdowns in that window.