CentOS Stream 8
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Initial Settings : Configure Services2021/02/19

To enable or disable services, Configure like follows.
[1] Display services list.
# the list of services that are active now

[root@dlp ~]#
systemctl -t service

UNIT                            LOAD   ACTIVE SUB     DESCRIPTION
atd.service                     loaded active running Job spooling tools
auditd.service                  loaded active running Security Auditing Service
chronyd.service                 loaded active running NTP client/server
crond.service                   loaded active running Command Scheduler
dbus.service                    loaded active running D-Bus System Message Bus
user-runtime-dir@0.service      loaded active exited  /run/user/0 mount wrapper
user@0.service                  loaded active running User Manager for UID 0
vdo.service                     loaded active exited  VDO volume services

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

54 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.

# list of all services

[root@dlp ~]#
systemctl list-unit-files -t service

UNIT FILE                                  STATE
arp-ethers.service                         disabled
atd.service                                enabled
auditd.service                             enabled
autovt@.service                            enabled
blk-availability.service                   disabled
usb_modeswitch@.service                    static
user-runtime-dir@.service                  static
user@.service                              static
vdo-start-by-dev@.service                  static
vdo.service                                enabled

199 unit files listed.
[2] Stop and turn OFF auto-start setting for a service if you don'd need it. (it's [smartd] as an example below)
[root@dlp ~]#
systemctl stop smartd

[root@dlp ~]#
systemctl disable smartd

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