While exporting user data there is a limit of exporting a maximum of 4000 records in one go (by default it will export only 500 records), so while exporting records more than 4000 you have to follow the steps mentioned below:
We can specify the number of records to be exported. As of now, we can export a maximum of 4000 products at a time. In the second time you can define number of records as the remaining records, those were not exported in the first attempt.
Start marker allows you to set the starting index for the export. The export will skip the number of products specified in the field. For example, if the store has 5800 products and we specify 4001 in start marker, then it will skip first 4000 products & export remaining 1800 products.