Steps to reproduce:

1. Create and open a 3D URP Project
2. Open the Preferences Window and go to the General Tab & Enable the "Use new Hierarchy window" option
3. In the Hierarchy create any Game Object and drag it into the Project Browser to create a Prefab
4. Expand the right edge of the Hierarchy until the "Open Prefab Asset in context" button is visible
5. Contract the same Hierarchy edge so that the horizontal scrollbar in the Hierarchy is no longer visible
6. Close the Editor and reopen the Project
7. Observe the Hierarchy again

Actual results: The Prefab Column position is not saved and the horizontal scrollbar is visible again in the Hierarchy

Expected results: When reopening the Project after having changed the column's position in the Hierarchy it is not reset

Reproducible with versions: 6000.3.10f1, 6000.4.0b10, 6000.5.0a1, 6000.5.0a7

Not reproducible with versions: 6000.0.68f1

Tested on (OS): Windows 11

Notes:

• Issue might inconsistently reproduce on different devices with different display setups