Hi Mo,
This is just a warning that you are exporting more than 100 objects according to: https://docs.mendix.com/refguide/transient-objects-garbage-collecting#detecting-requests-with-large-state.
You can set the threshold for this warning in the
com.mendix.webui.StateSizeWarningThreshold
When you are trying to export from a data grid, you can adjust the max number of rows to export in the export button setting.
Is that what you're trying to achieve?