Why Pivot table has the field values ?

Hello, Ahmad,
 
Thank you for writing to us.
 
Please see our answers below:

1) If we understand you correctly, by "summation values" you mean the aggregation names that are added to the measures' captions, for example, Sum of ..., Count of ..., etc
This can be turned off by setting showAggeregationLabels: false in the options object:

options: {
  viewType: "charts",
  showAggregationLabels: false 
}

Here is a JSFiddle example for illustration: https://jsfiddle.net/flexmonster/ecknxs8b/

2) About the names of the sections in the Field List ( https://www.flexmonster.com/doc/slice/#!change ):
Flexmonster is a pivot table component and charts are an additional data visualization tool (hence the name: "Flexmonster Pivot Table & Charts"). For this reason, the Field List sections' names correspond to pivot table namings.
The Field List assists in choosing which fields are to be displayed in the Report Filters, Rows, Columns, and Values report sections.
In case you would like to change the labels for the Report Filters, Rows, Columns, and Values Field List sections, this can be done by setting the desired labels via localization: https://www.flexmonster.com/doc/localizing-component/
 

Please let us know if you have any questions.
 
Best Regards,
Vera