Is there a way to set level on headers displayed on the outline section?

[Jasenkoo]

I am not sure if it is called outline but, on the right side where the On this page is shown. Is it possible to display in the TOC stye, for example:

# Main title

## Sub header 1

### Sub sub header 1

As it is now, It will only show Sub header 1, is it possible to add Sub sub header 1 under Sub header 1?

[Jasenkoo]

Sorry, answered here