Thanks for asking about that! The article Converting pages to the new editor describes the process a bit more. The benefit of the individual page conversion is that you get to confirm how your page will look before transitioning it to the new editor.
If you still want to have your pages migrated in bulk to the new editor, you can have your site admin raise a ticket with support. Refer to my response to the question, "Solved: Converting existing pages to the new editing experience
Per the feature request, CONFCLOUD-65768 (Convert pages and templates to new editing experience):
You can opt-in your instance to have all your pages migrated to the new editor by contacting Cloud Support. This means every existing page, including templates, will be migrated as you edit the page.
We're working to offer in the future an option to migrate each page proactively without having to opt-in your entire instance.
Any templates that we can migrate will convert to the new editor, but if a template has content that isn't supported in the new editor it will remain in the old editor unless you remove the content that is unsupported (i.e. a table nested inside a table for example).
I hope that helps! Let me know if you have any further questions.
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