I want to change the text of the header(month) cell. this text!
By hiding the default headers (headerHeight=0, viewHeaderHeight = 0) and adding the custom header you can add the required text. We have a KB documentation for the same. Please find the KB from the following link.
Also, we have a KB documentation for customize the cell using cellBuilder. Please find the UG and KB documentation from the following link.
UG link: https://help.syncfusion.com/flutter/daterangepicker/builders#cell-builder