Remove the default display:none code 

1). Open Subscription-product.liquid

2). Locate: <section id="recurring_choice_{{product.id}}" style="display:none;"> and remove the style="display:none;" line from the code.

This will show both subscription buttons on the product page.

Add Classes for individual control over Subscription types.

1). On the Subscription-product.liquid Locate the radio_option for Single Purchases and add the class single_purchase.

2). On the Subscription-product.liquid Locate the radio_option for Reoccurring Purchases and add the class reoccurring_purchase.

Show or Hide Specific Buttons

1). Open custom.scss

2). If you want to hide the single purchase radio button, add the following code:

    .single_purchase {
        display: none;
    }