Steps to reproduce:

1. Open a Unity Project
2. Open UI Toolkit Editor WIndow Creator via Create > UI Toolkit > Editor Window
3. Type 'TestEditorWindow' as the name for the asset. Ensure that UXML is checked
4. Click confirm to create the Editor Window
5. Open the TestEditorWindow via Window > UI Toolkit > TestEditorWindow
6. Enable UI Toolkit Live Reload on the window by clicking the more options ( : ) menu and checking the UI Toolkit Live Reload option
7. With the TestEditorWindow still open, open the TestEditorWindow.uxml file in UI Builder by double clicking on it

Actual results: The default colour for the text is black in the UI Builder (and in runtime UI) whereas it is white in the Editor Window. While this is expected, it is not possible to change the colour of the Editor Window text to be the default black colour without changing the colour to something else and then changing it back again.

Expected results: It is possible to make the Editor Window text colour to be the default black without needing to workaround by setting the colour to something else then setting it back

Reproducible with versions: 6000.1.0a6, 6000.0.30f1, 2022.3.53f1

Not reproducible with versions: - 

Can't test with versions: 2021.3.45f1 (not supported by Ubuntu 24.04)

Tested on (OS): Ubuntu 24.04

Notes: -