*Steps to reproduce:*
# Create a new Unity Project
# Create a UI Document (Assets > Create > UI Toolkit > UI Document)
# In the newly created PanelSettings, set Render Mode to World Space
# In the Project window, create a new UXML (Right-click > Create > UI Toolkit > UI Document)
# Double-click the UXML to open it in the UI Builder
# Add two buttons to the canvas
# In the Hierarchy, select the UI Document and in the Inspector, set Size Mode to Dynamic
# Observe the UI size in the Scene View
# In the Project window, select the PanelSettings asset
# Change the Render Mode from World Space to Screen Space - Overlay
# Observe the UI size again in the Scene View

*Actual results:* The UI size changes noticeably when switching the PanelSettings Render Mode

*Expected results:* The size of the UI should remain consistent regardless of the Render Mode

*Reproducible with versions:* 6000.2.0b1

*Tested on (OS):* macOS 15.5 (Silicon M4), Windows 11

*Notes:*
*  The inconsistency might affect layout fidelity during UI transitions or when toggling modes dynamically at runtime.