Currently, it isn't possible to export results from Sourcing without saving the results into a project first, as you can do with all the other tools.
To save sourcing results into a project, follow the steps below:
1. From the 'Opportunities found' click 'Save all results to Project'
2. Choose the project and column you wish to save the results to and click 'Save cards'
To export the results once they've been saved into a project:
1. Open the project in which the results have been saved to
2. From the column the results were saved to, click the 3 dots button at the top right corner
3. Click 'Export column' and then 'Export data'.
The data will be sent to your registered email.