Hello
@RayMizzi ,
If you've customized the checkout page using the checkout customizer, those customizations only apply to the specific plan you've modified. They won't automatically apply to all plans.
If you want the same checkout customization for other plans, you can use the import/clone design option within the checkout customizer to import the design into the new not customized plan as well.
For more details, please refer to the screenshot below.
To learn more about import/clone designs option, please see the tutorial video provided below.
I hope this answers your concerns, if you have any other concerns please feel free to let us know we are here to assist you.