Thanks for the reply. I am not seeing any options for logs within Security on either Player or Server. The only related option I can see on the player side is “Don’t delete log files on exit” which is unchecked.
Server > Status has an option for Server logs, which had been set to 6 – Standard. I changed that to 3 – Error.
For the M-* and R-* within the .nx folder, my issue wasn’t so much that there were a lot of folders there, but that a few of them had ballooned in size. The largest folder was taking up ~240GB of disk space and a number of other folders were in the ~30GB range.