If you are using Online Store 2.0 theme. You can activate popup form app embed feature in your theme. When the app is uninstalled, the app embeds will be removed automatically.
- From your Shopify admin, go to Online Store > Themes.
- Find the theme that you want to edit, and then click Customize.
- Click Theme settings.
- Click the App embeds tab.
- Click the toggle to activate Enable Popup Form.