Currently there is no switch exposed in the UI for controlling this. Logs associated with active debug session are saved in the folders you noticed, once the debug session is ended. Note that only the most recent 4 logs (if I remember correctly) are kept.
Are those folders interfering in any way with your work/projects? Maybe we can plan adding a preference that controls the logging mechanism for each RTOS plugin.
Regards,
MCUXpresso IDE Support