The option for edit CSS/HTML doesn’t exist when I got to CUSTOMIZE > THEMES and choose the currently active theme.
How to see the edit option?
where i will go and edit and see the preview.
A user asks how to edit CSS/HTML in a theme when the option is missing in the Customize > Themes section. Moin explains that users can create a new theme component via Admin → Customize → Install → Create New (type: Component), attach it to the theme, and then access the Edit CSS/HTML option. A preview button is also available at the bottom of the component editor.