ScriptReference/Event.Use

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ScriptReference/Event.Use

https://docs.unity3d.com/ScriptReference/Event.Use.html

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Comment by @KuroiRoy:

Event.Use() will stop the event from being used after your code, but the Scene view will keep registering mouse clicks unless you use the following code. The important part is GUIUtility.hotControl = 0; which will indicate that no control is currently active and prevent the unwanted selection of gameobject for example.

void OnSceneGUI () {  
    Event e = Event.current;  
  
    var controlID = GUIUtility.GetControlID(FocusType.Passive);  
    var eventType = e.GetTypeForControl(controlID);  
    if (eventType == EventType.MouseUp) {  
        Debug.Log("Mouse Up!");  
        GUIUtility.hotControl = controlID;  
        e.Use();  
    }  
    else if (eventType == EventType.MouseDrag) {  
        Debug.Log("Mouse Drag!");  
        e.Use();  
    }  
    else if (eventType == EventType.MouseDown) {  
        Debug.Log("Mouse Down!");  
        GUIUtility.hotControl = 0;  
        e.Use();  
    }  
}

(from: EventType.MouseUp not working on Left Clicks.)