If you are setup with a Direct Integration Software (QBO, Xero, or Intacct), you can re-sync your Accounting from the Locations tab in Settings.
After selecting the location, the Sync Accounting button will be in the top-right corner.
If using a CSV Based Export, you can reach out to your Customer Success team for help at firstname.lastname@example.org. They will be able to provide better details on changing your Chart of Accounts.
If it's changes to single GL accounts, feel free to check on How to add/edit a GL code? for better details.