FIX: New Input System warning dialog is misleading when not using input system (#2358)

Co-authored-by: João Freire <joao.freire@unity3d.com>

Author: josepmariapujol-unity

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased] - yyyy-mm-dd
 
+### Fixed
+
+- Improved New Input System warning dialog, Native Device Inputs Not Enabled [UUM-132151].
+
+### Changed
+
+### Added
 
 
 ## [1.19.0] - 2026-02-24

Packages/com.unity.inputsystem/InputSystem/InputSystem.cs

@@ -3587,11 +3587,27 @@ private static void ShowRestartWarning()
                 !EditorPlayerSettingHelpers.newSystemBackendsEnabled &&
                 !Application.isBatchMode)
             {
-                const string dialogText = "This project is using the new input system package but the native platform backends for the new input system are not enabled in the player settings. " +
-                    "This means that no input from native devices will come through." +
-                    "\n\nDo you want to enable the backends? Doing so will *RESTART* the editor.";
+                const string dialogText = "The new Input System Package is installed, but not configured to enable native device input, such as keyboard, mouse, or gamepad actions. " +
+                    "\n\nThe Active Input Handling parameter must be set to \"Input System Package (New)\", under Project Settings > Player." +
+                    "\n\nNote: Changing the active input handling requires to restart the Editor.";
 
-                if (EditorUtility.DisplayDialog("Warning", dialogText, "Yes", "No"))
+                bool userChoseEnableAndRestart;
+#if UNITY_6000_3_OR_NEWER
+                userChoseEnableAndRestart = EditorUtility.DisplayDialog(
+                    "Input System native platform backend not enabled",
+                    dialogText,
+                    "Enable & Restart",
+                    "Don't Enable",
+                    DialogOptOutDecisionType.ForThisSession,
+                    "RestartInstalledInputHandlingWarning");
+#else
+                userChoseEnableAndRestart = EditorUtility.DisplayDialog(
+                    "Input System native platform backend not enabled",
+                    dialogText,
+                    "Enable & Restart",
+                    "Don't Enable");
+#endif
+                if (userChoseEnableAndRestart)
                 {
                     EditorPlayerSettingHelpers.newSystemBackendsEnabled = true;
                     EditorHelpers.RestartEditorAndRecompileScripts();