Effective in version 10.4.0, you can use the infacmd ms UpdateOptimizationDefaultLevel command to set the optimizer level of the mappings in an application to the default level, Auto.
When you run the command, you must specify an application name. UpdateOptimizationDefaultLevel sets the optimizer level for all mappings in the application with optimization level Normal. The command does not affect mappings in the application with optimization level other than Normal.