The XYplorer settings are stored in the application data path. There are several ways to find this path:
Note that this path contains the complete configuration. Therefore, it's easy to back it up, restore it from a backup, copy it to a parallel installation, or take it with you on a flash drive.
The path is set to %appdata%\XYplorer by default, but can be easily changed by editing the Startup.ini file located in the XYplorer.exe directory (go there by menu Go | Go to Application Folder).