Forms have related lists which points to another tables that contain the related records. Just in case , a user want to export the records of a related list on a form , you might observe that export option is not available when you right click on the column headers of the related list records.
This solution talks about how you can export the related list records. Out of the box, there is no direct export option available for related list records. The only way to export them is to go to the respective form -> Related list section -> Observe the funnel icon ( for filters) -> Beside this you will see a hyperlink in context with the data in the related list . Hover over this hyperlink -> Right click -> Click on open in a new windows. This will open the related list records in a new window where you will have the normal export option by doing a right click on the column headers.