Yes, you may edit the name or enable Xero Categories to be used after the setup. Click on Configuration and then Lists. The Xero Categories will be under Xero Category.
If you wish to add new Xero Categories to the list this should be done in Xero and the Integration’s Configuration will need to be refreshed. After you have added the new codes in Xero, then go back into Soldo to click on Integration, then click on the Refresh button in the top right hand corner of the active Xero intergation. This will refresh the list. It may take a couple of minutes for the list to finish refreshing.