You can remove Checkout Master very easy. You can do so by Unpublishing it.

Unpublishing Checkout Master will hide it from the eyes of your customers so you can customize it, test new features or integrations. Unpublishing will also show the native Shopify checkout. Don't worry, you can always re-publish it with just one click when you are ready to start using it again.

To Unpublish your checkout, follow these steps:

1. Click on the arrow next to your store name at top right corner
2. Go to Manage Store
3. Click the Unpublish button
4. You are all set to configure and test your checkout before re-publishing it

If you are unable to do it this way, it may be because you deleted the app from Shopify.

In this case, please follow the instructions below.

1. When in Shopify, go to Online Store > Themes.

1. Then click on ... and chose Edit code.

1. In Search files type theme.liquid.