How to enable the Table of contents button in knowledge article.

[deepika987]

when i open any knowledge article the table of content is greyed out by default,even though its added in system properties glide.ui.html.editor.v4.toolbar.line1

Can anyone please let me know how to make this editable 

[Ania_Maria]

I experienced it too. It's getting active when you add text to the article body that contains text formatted as heading.