How to release default swap space

[jzhang18]

how to release /dev/zram0 to 5 during boot time? 

Just
sudo apt-get purge zram-config

Thanks  a lot.   after reboot, looks clean:
 
jzhang18@rockpro64:~$ free -h
              total        used        free      shared  buff/cache   available
Mem:           3.8G        284M        3.2G         23M        292M        3.5G
Swap:          6.0G          0B        6.0G
jzhang18@rockpro64:~$ sudo swapon --show
[sudo] password for jzhang18:
NAME      TYPE SIZE USED PRIO
/swapfile file   6G   0B   -1