Support for AJAX / drawer / pop-up / slide-out carts has been added for the following themes:
Supply
Narrative
Boundless
Brooklyn
Pop
If your theme uses an AJAX cart and is not listed above, please contact us, and we'll see if we can add support for your theme.
The steps to disable your AJAX cart depends on your theme. For many free Shopify themes:
In your Shopify control panel, click on Online Store --> Themes
Click the "Customize" button for your current theme
Click the "Theme Settings" tab
Click the "Cart" heading
Uncheck "AJAX Cart" / "Drawer Cart" / etc
Click the "Save" button