Use the 'Period' filter at the left, select 'Other' and enter the desired period (enter the same date in the left and the right field for one day).
Click on the 'Export' button (↓).
Enter a description of your export.
Select the desired export template.
Click on 'Export enrolments'.
Your export appears at the top of the page with an overview of all the exports of the type 'Enrolments'.
Refresh the page until you see the number of rows next to your export.
Click on the description to download your export file.