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CallEditorModalExample.cs

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+using EditorModal;
+using UnityEditor;
+
+public class CallEditorModalExample
+{
+    [MenuItem("Window/Plugins/EditorModal/Open Editor Modal Example")]
+    [MenuItem("Editor Modal/Open Editor Modal Example")]
+    private static void OpenEditorModal()
+    {
+        EditorPopupModal popupModal = (EditorPopupModal)EditorWindow.GetWindow(typeof(EditorPopupModal), true, "NOTICE", true);
+        popupModal.ShowModalUtility();
+        popupModal.Focus();
+    }
+}

EditorModal.cs

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+//Author: https://github.com/seekeroftheball
+
+using UnityEditor;
+using UnityEngine;
+
+namespace EditorModal
+{
+    public class EditorPopupModal : EditorWindow
+    {
+        private struct WindowBounds
+        {
+            public const float WindowWidth = 242;
+            public const float WindowHeight = 72;
+
+            public static Vector2 WindowSize = new(WindowWidth, WindowHeight);
+        }
+
+        private EditorPopupModal()
+        {
+            minSize = WindowBounds.WindowSize;
+            maxSize = WindowBounds.WindowSize;
+        }
+
+        private void OnGUI() => DrawWindow();
+
+        private void OnInspectorUpdate() => Repaint();
+
+        private void DrawWindow()
+        {
+            GUILayout.Label("Here's some text in a pop-up window.\n\nPress Close to dismiss this message.", EditorStyles.wordWrappedLabel);
+
+            if (GUILayout.Button("Close"))
+                Close();
+        }
+    }
+}