PrestaShop default checkout offers the multi-step checkout process so it will be good to use a One Page Checkout module to improve the user experience at your online store. The key features that you should consider for a One Page Checkout are the following:

1. Mobile responsive: The One Page Checkout should be mobile responsive.
2. Design control: Based on the business need you should have the option to select the checkout page design. It will be good to easy to handle design.
3. Look and Feel setting: Look & feel settings will help you to customize the look and feel of the checkout page.
4. Social login: You can also offer the login using the social accounts.
5. Shipping & Payment methods: The One Pae Checkout module should be compatible with the multiple payment and shipping methods.

For more details. Please click on the link below:
https://addons.prestashop.com/en/express-checkout-process/18016-one-page-checkout-social-login-mailchimp.html