When you restore Kodi or copy your existing Kodi userdata folder to another device it will always default the guisettings.xml, always. Even if you drop your previous settings into Kodi via a network folder, it will still reload it to default upon restart. This is because the guisettings.xml can't be written into the userdata folder when Kodi is running. To prevent this from happening, overwrite the guisettings.xml with SSH using two programs. One to stop and start the Kodi process and one to copy over the backed up guisettings.xml file that contains all your GUI goodness.
My collection of Home Assistant, CoreELEC, IoT, Synology, Kodi and other technical tips gathered over the years.