Code
cp /usr/lib/udev/rules.d/95-udevil-mount.rules /storage/.config/udev.rules.d/95-udevil-mount.rules
nano /storage/.config/udev.rules.d/95-udevil-mount.rules
append the partition names you do not want mounted to the list, see udevil: prevent noobs partitions from auto-mounting by chewitt · Pull Request #386 · LibreELEC/LibreELEC.tv · GitHub and reboot. The new modified file will be used instead of the embedded one. If you have not named the partitions, name them.
