There are a few different ways to remove launcher 3 from your Android device. One way is to uninstall the launcher 3 app from your device. To do this, go to your device's settings, then to the apps section, and find launcher 3. Tap on the app, then tap on the uninstall button.
Another way to remove launcher 3 is to disable it. To do this, go to your device's settings, then to the apps section, and find launcher 3. Tap on the app, then tap on the disable button.
You can also try resetting your device to its factory settings. This will remove all apps, including launcher 3, from your device. To do this, go to your device's settings, then to the system section, and tap on the reset button.