Steps to reproduce:

1. Open the attached project
2. Open the NewUXMLTemplate asset
3. In the UI Builder inspector, select VisualElement in the Hierarchy
4. Left-click on one of the values in the Spacing/Border Widget

Actual results: The existing value is not automatically selected after the left-click. Instead, the Selector is moved to the beginning of the Value, causing the User to amend instead of to replace the existing value

Expected results: The existing value is automatically selected after the left-click, allowing the User to quickly replace it. Other Inspector value fields behave in this way

Reproducible with versions: 6000.0.14f1, 6000.0.49f1, 6000.1.4f1, 6000.2.0b2

Not reproducible with versions: 2022.3.62f1, 6000.0.13f1

Tested on (OS): macOS 15.4.1