If you want to just export album hierarchy (not the media associated with it), click on arrow widget adjacent '+' sign and select 'Save albums to file'.
If you want to export all images belonging to all 10 albums, then select all albums and merge them into a single album. Now select this album which will show all media in grid. Select all media and click on 'File->Export as new files'.
Let me know if you were referring something else.