Hi Dario,
That UI is the search instance options, which you can access here: https://i.imgur.com/xA7WXeg.png
The Index Table options are sort of ‘global’, but not automatically enabled for the search instances by default – as it is possible to create multiple search bars.
For more detailed information, you can check these documentation sections:
– Index Table in general
– Generating the index table
– Enabling the index table