customize fields option

Hello,

Thank you for reaching out to us.

It is possible to hide the report filters, rows, columns, values sections and Calculated values button using the CSS rules:

.fm-btn-add-measure {
  display: none !important;
}

#fm-pivot-view .fm-fields-view .fm-popup-content .fm-list-wrap:not(.fm-list-wrap-all) {
  display: none !important;
}

Feel free to see the example: https://jsfiddle.net/flexmonster/7wtb9mva/ 
Alternatively, you can add your custom Field List. You are welcome to check the following JSFiddle for reference: https://jsfiddle.net/flexmonster/8hjrmu4g/ 
Could you please provide more information on your use case? Why do you need to remove those sections?

Looking forward to hearing from you.

Kind regards,
Nadia

Hello Fabrizio,

Thank you for the feedback!

We are glad to hear that it works for you.

As always, feel free to contact us in case other questions arise.

Kind regards,
Nadia