Open Gimp's settings dialog. I don't think you have to worry about settings disappearing in newer releases. Which, major releases of Gimp are so slow anyways,

Open Gimp's settings dialog. I don't think you have to worry about settings disappearing in newer releases. Which, major releases of Gimp are so slow anyways, if it was a realistic worry for this software specifically (it's not), it would probably be 10+ years before such a change hit stable.