How to apply table of contents to all posts

Hello,

Thank you for contacting Rank Math and bringing your concern to our attention.

Unfortunately, the blocks should be added to your post manually, and there’s no option to add them to all of your posts.

However, you can use the reusable block option to add them easily to your posts:
https://rankmath.com/kb/table-of-contents-block/#reusable-table-of-contents

Hope that helps.

Thank you.