Unity editor - How to stop field from turning blue when its edited - unity3d

Question

I am making a tool in Unity to build your project for muliple platforms when you press a button.
I started with the preferences window for the tool, and came up with an anoying thing. Whenever I change the enum value of the EnumPopup field, the field turns blue in the editor window. Is there a way to disable this?
See how in the 2nd picture the field is not blue, and in the 3rd picture the field has changed to blue? How do I prevent this from happening?
Thanks in advance!

Answer 1

Difficult to help without having the rest of your code.
This is Unity built-in behaviour. I tried a lot of stuff see here to disable / overwrite the built-in coloring of prefix labels but had no luck so far.
A workarround however might be to instead use an independent EditorGUI.LabelField which will not be affected by the EnumPopup together with the EditorGUIUtility.labelWidth:
var LabelRect = new Rect(
FILEMANAGEMENT_ENUMFIELD_RECT.x,
FILEMANAGEMENT_ENUMFIELD_RECT.y,
// use the current label width
EditorGUIUtility.labelWidth,
FILEMANAGEMENT_ENUMFIELD_RECT.height
);
var EnumRect = new Rect(
FILEMANAGEMENT_ENUMFIELD_RECT.x + EditorGUIUtility.labelWidth,
FILEMANAGEMENT_ENUMFIELD_RECT.y,
FILEMANAGEMENT_ENUMFIELD_RECT.width - EditorGUIUtility.labelWidth,
FILEMANAGEMENT_ENUMFIELD_RECT.height
);
EditorGUI.LabelField(LabelRect, "File relative to");
QuickBuilder.Settings.Relation = (QuickBuilder.Settings.PathRelation)EditorGUI.EnumPopup(EnumRect, QuickBuilder.Settings.Relation);
As you can see the label is not turned blue while the width keeps being flexible
Sidenotes
Instead of setting values via edito scripts directly like
QuickBuilder.Settings.Relation = you should always try and use the proper SerializedProperty. It handles things like Undo/Redo and also marks the according objects and scenes as dirty.
Is there also a special reason why you use EditorGUI instead of EditorGUILayout? In the latter you don't need to setup Rects.
EditorGUILayout.BeginHorizontal();
{
EditorGUILayout.LabelField("File relative to", GUILayout.Width(EditorGUIUtility.labelWidth));
QuickBuilder.Settings.Relation = (QuickBuilder.Settings.PathRelation)EditorGUILayout.EnumPopup(QuickBuilder.Settings.Relation);
}
EditorGUILayout.EndHorizontal();