Table Of Contents CK Pro v1.2.3 does not work

you can use the css to style your list
give me the url of the page so that I can check

I did something with css. But what can I do with numbers?

you can do something like

I know that, but I would prefer ordered list with with numbers in order

by default is is <ol>, so this ordered list using numbers
I have never tried to flatten the imbricated lists, because this would mean to change the way the html code is rendered
may be tha tyou can try to remove the numbers from the list, and add a css counter on each line
blog.logrocket.com/styling-numbered-lists-with-css-counters/

Thinking about it. Thank you for help.