Yes, the checkbox is to enable editing the list of functions in the field.
Virtual DataPort automatically uses suitable configurations for most common data sources. For JDBC data sources, all the scalar functions listed will be delegated to the underlying data source by default. You can disable the delegation of a certain function by removing it from the list.
You can check if the functions are delegated by viewing the Execution Trace tab found in the Query Results after executing a statement.
You can refer to the [Data Source Configuration Properties](https://community.denodo.com/docs/html/browse/7.0/vdp/administration/creating_data_sources_and_base_views/data_source_configuration_properties/data_source_configuration_properties) and [Execution Trace of a Statement](https://community.denodo.com/docs/html/browse/7.0/vdp/administration/creating_derived_views/querying_views/execution_trace_of_a_statement) section of the Virtual DataPort Administration Guide for more information.
Hope this helps!