To export your solution articles, go to Quick views > All articles, represented by the hamburger menu under the 'Solutions' tab in Freshdesk.
From the Article list view that opens, select all the articles you are looking to export and click on thebutton. This will open a window where you can select all the columns to be displayed in the exported file. Click on Export once you have selected the required columns. You will receive an email with the .CSV file that you can download. You can also filter articles in the Article list view and export only those articles.
Please note that only agents who have been given export access (available under the Solutions section while editing or creating a role within Admin settings > Roles) can export articles.