You can now migrate your website to the new editor.
Please note that this will create a copy of your website with all the settings and content from your website. It'll not convert the design you applied to your site. You can always go back to the "older version" in case you don't like the new Editor or can't add the design you want to apply.
To do so please click the button "Migrate to new Editor":
You will see the following screen. Please review the changes and confirm the switch:
In case you don't see this button on your site your site is already the newest version or version 1 which can't be converted. Learn more about the different versions here.