Yes, device mode is (by default) active on quite a few (potentially) dangerous settings, you need to set device-mode to allow what you want to do, see:
scheduler is one of the items that can be locked, likely you have it disabled, check with: /system/device-mode/print
With factory-firmware: 7.19.5, it's not "grandfathered" into more permissive device-mode scheme, so it's in "home" in the device-mode scheme.
Now device-mode is such a dumb and flawed concept, so don't ask me to defend the scheme but no sense in inflect "RTFM" on another victim of device-mode ills
And docs do describe this, but at end of day you'll likely need:
/system/device-mode/update mode=advanced
Then UNPLUG the router from power (or hit a button) within 5 minutes (by default).
In the Mikrotik terminal, I use the command
/system/device-mode/update mode=home scheduler=yes
> /system/device-mode/update mode=home scheduler=yes update: turn off power or reboot by pressing reset or mode button in 4m22s to activate changes
Afterwards, I tried rebooting Mikrotik and even turning it off for a couple of minutes.
After turning on the router, I look at scheduler: no:
> /system/device-mode/print mode: home allowed-versions: 7.13+,6.49.8+ flagged: no flagging-enabled: yes scheduler: no socks: no fetch: no pptp: yes l2tp: yes bandwidth-test: no traffic-gen: no sniffer: no ipsec: yes romon: no proxy: no hotspot: no smb: yes email: no zerotier: no container: no install-any-version: no partitions: no attempt-count: 2
You don't reboot the router yourself. it should reboot when you press the mode button. You can also try to unplug from power as written. You unplug from power while you see the device mode message that tells you so. Unplugging anytime later, or even after a manual reboot, does nothing with device mode.
Figured it out.
When I ran the command in the terminal (-- [Q quit|D dump|C-z pause]), I pressed Q and went to the router and pressed the mode button. But you shouldn't press Q when running the command.
When I press the mode button, the router reboots itself.