I am trying out Kinoite for a while. KDE is very new to me. A fairly steep learning curve. Here’s a basic question: how do you change the time format to 24 hour time?
Have a look here, this might help you:
I’ve got 24 hour time in the taskbar at the bottom of the screen now, but not on the lock screen. Do you know how to change it on the login screen?
Did you restart your system once?
Which login manager are you using ?
p.s.
As the 24h time is set with the locale, you have to check that you use a different locale while login. As you use a immutable os this might changes just when you update it.