Thank you for the response and as far as only 200 records getting displayed. This is working as designed. There is a section in the documentation on how to change the default limit that is put on the query.
Please see the link below, the section you want to review is Limiting the amount of data collected: Collecting data to analyze
Take a look at the screen shot below for more information:

Once you have made the above change, there could be a possibility that the number of records you are trying to export may increase in future, which may result in error related to Memory (Out of Memory). To avoid this from happening, please do raise a ticket and get the JS maxMB value confirmed and updated accordingly.
Plese let us know if this works for you or not?
Naveen Kumar