1. From the Home tabin Setup, enter App in the Quick Find box, then select App Manager.
2. Find the Classic app that you want to upgrade in the apps list.Note A checkmark in the Visible in Lightning Experience column means that the app is accessible in Lightning Experience via the App Launcher and is fully functional.Even though a Classic app works in Lightning Experience, it doesn’t take advantage of all the benefits of being a Lightning app. That’s why we recommend that you upgrade it.
3. Click , and select Upgrade.Your Classic app is copied and upgraded forLightning Experience. You now have two versions of the app: a Classic version, and aLightning version. After you upgrade it, the Classic app is no longer accessible inLightning Experience via the App Launcher. You’ll still see the Classic app in the appslist, but with the Visible in Lightning column deselected.