As @susandennis suggested, start by changing them on the Console. This change will be reflected in future feeds data, but will not modify data already in your sheet— e.g. in Transactions or Balance History. If you care/need to update the older data in your spreadsheet you can use find & replace in Google Sheets.
I’m working on migrating an updated version of the Repair Balance History workflow from the soon-to-be-deprecated Tiller Utilities add-on into the Tiller Community Solutions add-on. That should be published in the next week and will also help true up old balance entries.
Good luck, @CHILL.
Randy